Holtek HT48R10A-1 User manual

HT48R10A-1, HT48R30A-1,
HT48R50A-1, HT48R70A-1
I/O Type MCU
Handbook
September 2003
Copyright Ó2003 by HOLTEK SEMICONDUCTOR INC. All rights reserved. Printed in Taiwan. No part of this publication
may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photo-
copying, recording, or otherwise without the prior written permission of HOLTEK SEMICONDUCTOR INC.

Contents
Part I Microcontroller Profile ................................................................... 1
Chapter 1 Hardware Structure ........................................................................................ 3
Introduction ....................................................................................................................3
Features ......................................................................................................................... 4
Technology Features ............................................................................................... 4
Kernel Features ....................................................................................................... 4
Peripheral Features ................................................................................................. 4
Selection Table .............................................................................................................. 5
Block Diagram ............................................................................................................... 6
Pin Assignment .............................................................................................................. 7
Pin Description ............................................................................................................... 8
Absolute Maximum Ratings ......................................................................................... 13
D.C. Characteristics ..................................................................................................... 13
A.C. Characteristics ..................................................................................................... 14
System Architecture ..................................................................................................... 15
Clocking and Pipelining ......................................................................................... 15
Program Counter ................................................................................................... 16
Stack ..................................................................................................................... 17
Arithmetic and Logic Unit -ALU ............................................................................ 18
Program Memory ......................................................................................................... 18
Organization .......................................................................................................... 19
Special Vectors ..................................................................................................... 19
Look-up Table ........................................................................................................ 20
Table Program Example ........................................................................................ 20
Data Memory ............................................................................................................... 21
Organization .......................................................................................................... 22
General Purpose Data Memory ............................................................................ 22
Special Purpose Data Memory ............................................................................. 23
Contents
i

Special Function Registers .......................................................................................... 23
Indirect Addressing Registers -IAR, IAR0, IAR1 ................................................ 24
Memory Pointers -MP, MP0, MP1 ....................................................................... 24
Accumulator -ACC ............................................................................................... 25
Program Counter Low Register -PCL ......................................................................... 25
Look-up Table Registers -TBLP, TBLH ................................................................ 25
Watchdog Timer Register -WDTS ....................................................................... 25
Status Register -STATUS .................................................................................... 25
Interrupt Control Register -INTC ......................................................................... 26
Timer/Event Counter Registers ............................................................................ 27
Input/Output Ports and Control Registers ............................................................. 27
Input/Output Ports ........................................................................................................ 27
Pull-high Resistors ................................................................................................ 27
Port A Wake-up ..................................................................................................... 28
I/O Port Control Registers .................................................................................... 28
Pin-shared Functions ............................................................................................ 28
Programming Considerations ................................................................................ 30
Timer/Event Counters .................................................................................................. 31
Configuring the Timer/Event Counter Input Clock Source .................................... 31
Timer Registers -TMR, TMR0, TMR0L/TMR0H, TMR1L/TMR1H ....................... 32
Timer Control Registers -TMRC, TMR0C, TMR1C ............................................. 33
Configuring the Timer Mode .................................................................................. 34
Configuring the Event Counter Mode .................................................................... 35
Configuring the Pulse Width Measurement Mode ................................................. 35
Programmable Frequency Divider (PFD) and Buzzer Application ........................ 36
Prescaler ............................................................................................................... 37
I/O Interfacing ........................................................................................................ 37
Programming Considerations ................................................................................ 37
Interrupts ......................................................................................................................38
External Interrupt ................................................................................................... 39
Timer/Event Counter Interrupt ............................................................................... 39
Interrupt Priority ..................................................................................................... 40
Programming Considerations ................................................................................ 40
Reset and Initialization ................................................................................................. 41
Reset ..................................................................................................................... 41
Oscillator ......................................................................................................................48
System Clock Configurations ................................................................................ 48
System Crystal/Ceramic Oscillator ........................................................................ 48
System RC Oscillator ............................................................................................. 49
Internal System RC Oscillator ................................................................................ 49
RTC Oscillator........................................................................................................ 49
Watchdog Timer Oscillator .................................................................................... 50
HALT and Wake-up in Power Down Mode .................................................................. 50
Watchdog Timer ........................................................................................................... 51
Configuration Options .................................................................................................. 52
Application Circuits ...................................................................................................... 53
ii
I/O Type MCU

Part II Programming Language ............................................................. 55
Chapter 2 Instruction Set Introduction ........................................................................ 57
Instruction Set .............................................................................................................. 57
Instruction Timing .................................................................................................. 57
Moving and Transferring Data ............................................................................... 58
Arithmetic Operations ............................................................................................ 58
Logical and Rotate Operations .............................................................................. 58
Branches and Control Transfer ............................................................................. 58
Bit Operations ....................................................................................................... 58
Table Read Operations ......................................................................................... 59
Other Operations ................................................................................................... 59
Instruction Set Summary ............................................................................................. 59
Convention ............................................................................................................ 59
Chapter 3 Instruction Definition ................................................................................... 63
Chapter 4 Assembly Language and Cross Assembler ............................................... 75
Notational Conventions ................................................................................................ 75
Statement Syntax ........................................................................................................ 76
Name ..................................................................................................................... 76
Operation .............................................................................................................. 76
Operand ................................................................................................................ 76
Comment ............................................................................................................... 77
Assembly Directives .................................................................................................... 77
Conditional Assembly Directives ........................................................................... 77
File Control Directives ........................................................................................... 78
Program Directives ................................................................................................ 79
Data Definition Directives ...................................................................................... 82
Macro Directives ................................................................................................... 84
Assembly Instructions .................................................................................................. 86
Name ..................................................................................................................... 86
Mnemonic .............................................................................................................. 86
Operand, Operator and Expression ...................................................................... 86
Miscellaneous ............................................................................................................. 88
Forward References .............................................................................................. 88
Local Labels .......................................................................................................... 88
Reserved Assembly Language Words .................................................................. 89
Cross Assembler Options ............................................................................................ 90
Assembly Listing File Format ....................................................................................... 90
Source Program Listing ......................................................................................... 90
Summary of Assembly .......................................................................................... 91
Miscellaneous ....................................................................................................... 91
Contents
iii

Part III Development Tools .................................................................... 93
Chapter 5 MCU Programming Tools ............................................................................. 95
HT-IDE3000 Development Environment ...................................................................... 95
Holtek In-Circuit Emulator -HT-ICE ............................................................................ 96
HT-ICE Interface Card ................................................................................................. 96
OTP Programmer ........................................................................................................ 97
OTP Adapter Card ....................................................................................................... 97
System Configuration .................................................................................................. 97
Installation ....................................................................................................................99
System Requirement ............................................................................................. 99
Hardware Installation ............................................................................................ 99
Software Installation .............................................................................................. 99
OTP HandyWriter ................................................................................................ 103
Chapter 6 Quick Start .................................................................................................. 105
Step 1 -Create a New Project ........................................................................... 105
Step 2 -Add Source Program Files to the Project ............................................ 105
Step 3 -Build the Project ................................................................................... 105
Step 4 -Transmit Code to Holtek ...................................................................... 105
Step 5 -Programming the OTP Device ............................................................. 106
Appendix ................................................................................................. 107
Appendix A Device Characteristic Graphics .............................................................. 109
Appendix B Package Information ................................................................................ 119
iv
I/O Type MCU

Preface
Since the founding of the company, Holtek Semiconductor Inc. has concentrated much of its de-
sign efforts in the area of microcontroller development. Although supplying a wide range of semi-
conductor devices, the microcontroller category has always been a key product category within
the Holtek range, and one which will continue to expand as their devices increase in functionality
and maturity. By capitalizing on the substantial accumulated skills within its dedicated
microcontroller development department, Holtek has been able to release a comprehensive
range of high quality low-cost microcontroller devices for a wide range of application areas.
Holtek¢s high quality embedded I/O microcontroller solutions provide a means for customers to
greatly enhance the functional contents of their products, which when combined with Holtek¢s com-
prehensive range of development tools provide designers with the means to reduce their design to
market times and greatly increasing their added value.
This handbook is divided into three parts for user convenience. Most details regarding general
datasheet information and device specification is located within Part I. Information related to
microcontroller programming such as device instruction set, instruction definition, and assembly
language directives is found within Part II. Part III relates to the Holtek range of Development Tools
where information can be found on their installation and use.
By compiling all relevant data together in one handbook we hope users of the Holtek range of I/O
Type microcontroller devices will have at their fingertips a useful, complete and simple means to ef-
ficiently implement their microcontroller applications. Holtek¢s efforts to combine information on de-
vice specifications, programming and development tools into one publication have produced a
handbook which with careful use by the user should result in trouble free designs and the maxi-
mum benefit being gained from the many features of Holtek microcontroller devices. We welcome
feedback and comments from our customers regarding further improvements.
Preface
v

vi
I/O Type MCU

Part I
Microcontroller Profile
Part I Microcontroller Profile
1

2
I/O Type MCU

Chapter 1
Hardware Structure
This section is the main datasheet section of the I/O Type microcontroller handbook and contains
all the parameters and information related to the hardware. The information contained provides de-
signers with details on all the main hardware features of the I/O Type microcontroller range which
together with the programming section contains the information to enable swift and successful im-
plementation of user microcontroller applications. By proper consultation of the relevant parts of
this section, users can ensure that they make the most efficient use of the flexible and
multi-function features within the I/O Type microcontroller series.
Introduction
The HT48R10A-1/HT48C10-1, HT48R30A-1/HT48C30-1, HT48R50A-1/HT48C50-1 and
HT48R70A-1/HT48C70-1 are 8-bit high performance, RISC architecture microcontroller devices
specifically designed for multiple I/O control product applications. Device flexibility is enhanced
with their internal special features such as HALT and wake-up functions, oscillator options, buzzer
driver, etc. These features combine to ensure applications require a minimum of external compo-
nents and therefore reduce overall product costs. Having the advantages of low power consump-
tion, high performance, I/O flexibility as well as low cost, these devices have the versatility to suit a
wide range of application possibilities such as industrial control, consumer products, subsystem
controllers, etc. Many features are common to all devices, however, they differ in areas such as
I/O pin count, RAM and ROM capacity, timer number and size etc.
The HT48R10A-1, HT48R30A-1, HT48R50A-1 and HT48R70A-1 are OTP devices offering the ad-
vantages of easy and effective program updates, using the Holtek range of development and pro-
gramming tools. These devices provide the designer with the means for fast and low cost product
development cycles. However, for applications that are at a mature state in their design process,
the HT48C10-1, HT48C30-1, HT48C50-1 and HT48C70-1 mask version devices offer a comple-
mentary device for products with high volume and low cost demands. Fully pin and functionally
compatible with their OTP sister devices, such mask version devices provide the ideal substitute
for products which have gone beyond their development cycle and are facing cost down demands.
Chapter 1 Hardware Structure
3
1

Features
Technology Features
·High-performance RISC Architecture
·Low-power Fully Static CMOS Design
·Operating Voltage:
fSYS=4MHz: 2.2V~5.5V
fSYS=8MHz: 3.3V~5.5V
·Power Consumption:
2mA Typical at 5V 4MHz
Maximum of 1mA Standby Current at 3V with WDT and RTC Disabled
·Temperature Range:
Operating Temperature -40°Cto85°C (Industrial Grade)
Storage Temperature -50°Cto125°C
Kernel Features
·Program Memory:
1K´14 OTP/Mask ROM (HT48R10A-1/HT48C10-1)
2K´14 OTP/Mask ROM (HT48R30A-1/HT48C30-1)
4K´15 OTP/Mask ROM (HT48R50A-1/HT48C50-1)
8K´16 OTP/Mask ROM (HT48R70A-1/HT48C70-1)
·Data Memory:
64´8 SRAM (HT48R10A-1/HT48C10-1)
96´8 SRAM (HT48R30A-1/HT48C30-1)
160´8 SRAM (HT48R50A-1/HT48C50-1)
224´8 SRAM (HT48R70A-1/HT48C70-1)
·Table Read Function
·Multi-level Hardware Stack:
4-level (HT48R10A-1/HT48C10-1, HT48R30A-1/HT48C30-1)
6-level (HT48R50A-1/HT48C50-1)
16-level (HT48R70A-1/HT48C70-1)
·Direct and Indirect Data Addressing Mode
·Bit Manipulation Instructions
·63 Powerful Instructions
·Most Instructions Implemented in 1 Machine Cycle
Peripheral Features
·From 21 to 56 Bidirectional I/O with Pull-high Options
·Port A Wake-up Options
·External Interrupt Input
·Event Counter Input
·Full Timer Functions with Prescaler and Interrupt
·Watchdog Timer (WDT)
·HALT and Wake-up Feature for Power Saving Operation
4
I/O Type MCU

·PFD/Buzzer Driver Outputs
·On-chip Crystal and RC Oscillator
·32768Hz Real Time Clock (RTC) Function
·Low Voltage Reset (LVR) Feature for Brown-out Protection
·In-circuit Programming Interface with Code Protection
·Mask Version Devices Available for High Volume Production
·Full Suite of Supported Hardware and Software Tools Available
Selection Table
The series of I/O microcontrollers include a comprehensive range of features, some of which are
standard and some of which are device dependent. Most features are common to all devices, the
main feature distinguishing them are Program Memory, Data Memory capacity, I/O count and
timer functions. To assist users in their selection of the most appropriate device for their applica-
tion, the following table, which summarizes the main features of each device, is provided.
Part No. VDD Program
Memory
Data
Memory I/O Timer Interrupt Stack Package
Types
HT48R10A-1
HT48C10-1 2.2V~5.5V 1K´14 64´821 8-bit´12 4 24SKDIP/SOP
HT48R30A-1
HT48C30-1 2.2V~5.5V 2K´14 96´825 8-bit´124
24SKDIP/SOP,
28SKDIP/SOP
HT48R50A-1
HT48C50-1 2.2V~5.5V 4K´15 160´835 8-bit´1
16-bit´136
28SKDIP/SOP,
48SSOP
HT48R70A-1
HT48C70-1 2.2V~5.5V 8K´16 224´856 16-bit´231648SSOP,
64QFP
Note Part numbers including ²C²are mask version devices while ²R²are OTP devices.
Chapter 1 Hardware Structure
5

Block Diagram
The following block diagram illustrates the main functional blocks of the I/O Type microcontroller
series of devices.
Note This block diagram represents the OTP devices, for the mask device there is no Device Programming
Circuitry.
6
I/O Type MCU
T i m i n g
G e n e r a t o r
S y s t e m R C /
X ' t a l O s c i l l a t o r I n s t r u c t i o n
D ecoder
I n s t r u c t i o n
R e g i s t e r
W D T
O s c i l l a t o r
D a t a
M e m o r y
A d d r e s s D e c o d e r
M e m o r y
P o i n t e r
M X A C C
Look-up
T a b l e
R e g i s t e r
C o n f i g .
R e g i s t e r
W a t c h d o g
T i m e r
R e s e t &
L V R
C o n f i g .
R e g i s t e r
T i m e r ( s ) /
C o u n t e r
B u z z e r
D r i v e r
C o n f i g .
R e g i s t e r
I n t e r r u p t
C i r c u i t
C o n f i g .
R e g i s t e r
I/O
P o r t s
D e v i c e
P r o g r a m m i n g
C i r c u i t r y
C o n f i g u r a t i o n
O p t i o n
P r o g r a m
M e m o r y
A d d r e s s D e c o d e r
S t a c k
S t a c k P o i n t e r
P r o g r a m
C o u n t e r
Look-up
T a b l e
P o i n t e r
T o P r o g r a m
M e m o r y
A L
S h i f t e r
MX
I n t e r n a l
R C O S C

Pin Assignment
Chapter 1 Hardware Structure
7
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
H T 4 8 R 1 0 A - 1 / H T 4 8 C 1 0 - 1
2 4 S K D I P - A / S O P - A
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
O S C 2 / P C 4
O S C 1 / P C 3
V D D
R E S
P C 2
P C 1 / T M R
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
V S S
P C 0 / I N T
H T 4 8 R 3 0 A - 1 / H T 4 8 C 3 0 - 1
2 8 S K D I P - A / S O P - A
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
O S C 2 / P G 2
O S C 1 / P G 1
V D D
R E S
P C 5
P C 4
P C 3
P C 2
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
V S S
P G 0 / I N T
P C 0 / T M R
P C 1
H T 4 8 R 3 0 A - 1 / H T 4 8 C 3 0 - 1
2 4 S K D I P - A / S O P - A
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
O S C 2 / P G 2
O S C 1 / P G 1
V D D
R E S
P C 2
P C 0 / T M R
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
V S S
P G 0 / I N T
H T 4 8 R 5 0 A - 1 / H T 4 8 C 5 0 - 1
2 8 S K D I P - A / S O P - A
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
O S C 2 / P G 2
O S C 1 / P G 1
V D D
R E S
P C 5 / T M R 1
P C 4
P C 3
P C 2
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
V S S
P G 0 / I N T
P C 0 / T M R 0
P C 1
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
H T 4 8 R 5 0 A - 1 / H T 4 8 C 5 0 - 1
4 8 S S O P - A
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
N C
N C
N C
N C
O S C 2 / P G 2
O S C 1 / P G 1
V D D
R E S
T M R 1
P D 3
P D 2
P D 1
P D 0
P C 7
P C 6
P C 5
P C 4
P C 3
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
N C
N C
N C
N C
P D 7
P D 6
P D 5
P D 4
V S S
P G 0 / I N T
T M R 0
P C 0
P C 1
P C 2
P B 6
P B 7
P A 4
P A 5
P A 6
P A 7
P F 0
P F 1
P F 2
P F 3
O S C 2
O S C 1
V D D
R E S
T M R 1
P D 3
P D 2
P D 1
P D 0
P C 7
P C 6
P C 5
P C 4
P C 3
P B 5
P B 4
P A 3
P A 2
P A 1
P A 0
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
P E 3
P E 2
P E 1
P E 0
P D 7
P D 6
P D 5
P D 4
V S S
I N T
T M R 0
P C 0
P C 1
P C 2
H T 4 8 R 7 0 A - 1 / H T 4 8 C 7 0 - 1
4 8 S S O P - A
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4

Note The pin compatibility features of the microcontroller SKDIP/SOP packages allow for straightfor-
ward upgrading to devices of higher functionality with minimal changes to application hardware.
Pin Description
HT48R10A-1/HT48C10-1
Pin Name I/O Configuration
Option Description
PA0~PA7 I/O
Pull-high
Wake-up
Schmitt Trigger
Bidirectional 8-bit input/output port. Each bit can be config-
ured as a wake-up input by configuration option. Software
instructions determine if the pin is a CMOS output or input.
Configuration options determine if all pins on this port have
pull-high resistors and if the inputs are Schmitt Trigger or
non Schmitt Trigger.
PB0/BZ
PB1/BZ
PB2~PB7
I/O Pull-high
I/O or BZ/BZ
Bidirectional 8-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if all pins on this port
have pull-high resistors. Pins PB0 and PB1 are pin-shared
with BZ and BZ, respectively.
8
I/O Type MCU
P A 6
P A 5
P A 4
P B 7
P B 6
P B 5
P B 4
P G 7 P G 6 P G 5 P G 4
P A 3
P A 2
P A 7
P F 0
P F 1
P F 2
P F 3
O S C 2
O S C 1
P F 4
P F 5
P F 6
P F 7
V D D
R E S
T M R 1
P D 3
P D 2
P D 1
P D 0
P C 7
P A 1
P A 0
P E 7
P E 6
P E 5
P E 4
P B 3
P B 2
P B 1 / B Z
P B 0 / B Z
P E 3
P E 2
P E 1
P E 0
P D 7
P D 6
P D 5
P D 4
V S S
P C 6 P C 5 P C 4 P C 3 P C 2 P C 1 P C 0 P G 3
P G 2
P G 1
P G 0
T M R 0 I N T
H T 4 8 R 7 0 A - 1
H T 4 8 C 7 0 - 1
6 4 Q F P - A
2 0 2 1 2 2 2 3 2 4 3 23 13 02 92 82 72 62 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
5 1
5 0
4 9
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
6 4 6 3 6 2 6 1 6 0 5 25 35 45 55 65 75 85 9

Pin Name I/O Configuration
Option Description
PC0/INT
PC1/TMR
PC2
I/O Pull-high
Bidirectional 3-bit input/output port. Software instructions de-
termine if the pin is a CMOS output or Schmitt Trigger input.
A configuration option determines if all pins on this port have
pull-high resistors. Pin PC0 is pin-shared with external inter-
rupt pin INT and PC1 shared with external timer pin TMR.
The external interrupt is activated on a high to low transition.
OSC1/PC3
OSC2/PC4
I
O
Pull-high
Crystal or RC or
Int. RC+I/O or
Int. RC+RTC
OSC1, OSC2 are connected to an external RC network or
external Crystal (determined by configuration option) for
the internal system clock. For external RC system clock op-
eration, OSC2 is an output pin for 1/4 system clock.
These two pins can also be optioned as an RTC oscillator
(32768Hz) or I/O lines. In these two cases, the system clock
comes from an internal RC oscillator whose nominal fre-
quency at 5V has 4 options, 3.2MHz, 1.6MHz, 800kHz,
400kHz. If the pins are used as normal I/O pins, then
pull-high options are available. If used as oscillator pins,
bits PC3 and PC4 will be free for use by the application pro-
gram. In this case the pull-high options are disabled.
RES I ¾Schmitt Trigger reset input. Active low.
VDD ¾¾ Positive power supply
VSS ¾¾ Negative power supply, ground
Note 1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration
is chosen for a particular port, then all input pins on this port will be connected to pull-high
resistors.
HT48R30A-1/HT48C30-1
Pin Name I/O Configuration
Option Description
PA0~PA7 I/O
Pull-high
Wake-up
Schmitt Trigger
Bidirectional 8-bit input/output port. Each bit can be config-
ured as a wake-up input by configuration option. Software
instructions determine if the pin is a CMOS output or input.
Configuration options determine if all pins on this port have
pull-high resistors and if the inputs are Schmitt Trigger or
non Schmitt Trigger.
PB0/BZ
PB1/BZ
PB2~PB7
I/O Pull-high
I/O or BZ/BZ
Bidirectional 8-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if all pins on this port
have pull-high resistors. Pins PB0 and PB1 are pin-shared
with BZ and BZ, respectively.
Chapter 1 Hardware Structure
9

Pin Name I/O Configuration
Option Description
PC0/TMR
PC1~PC5 I/O Pull-high
Bidirectional 6-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if all pins on this port
have pull-high resistors. PC0 is pin-shared with external
timer pin TMR.
PG0/INT I/O Pull-high
Bidirectional 1-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if the pin has a
pull-high resistor. PG0 is pin-shared with external interrupt
pin INT. The external interrupt input is activated on a high to
low transition.
OSC1/PG1
OSC2/PG2
I
O
Pull-high
Crystal or RC or
Int. RC+I/O or
Int. RC+RTC
OSC1, OSC2 are connected to an external RC network or
external Crystal (determined by configurations option) for
the internal system clock. For external RC system clock op-
eration, OSC2 is an output pin for 1/4 system clock.
These two pins can also be optioned as an RTC oscillator
(32768Hz) or I/O lines. In these two cases, the system
clock comes from an internal RC oscillator whose nominal
frequency at 5V has 4 options, 3.2MHz, 1.6MHz, 800kHz,
400kHz. If the pins are used as normal I/O pins, then
pull-high options are available. If used as oscillator pins,
bits PG1 and PG2 will be free for use by the application pro-
gram. In this case the pull-high options are disabled.
RES I ¾Schmitt Trigger reset input. Active low.
VDD ¾¾ Positive power supply
VSS ¾¾ Negative power supply, ground
Note 1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration
is chosen for a particular port, then all input pins on this port will be connected to pull-high
resistors.
3. Pins PC1 and PC3~PC5 only exist on the 28-pin package. On the 24-pin package, these pins
are not available.
HT48R50A-1/HT48C50-1
Pin Name I/O Configuration
Option Description
PA0~PA7 I/O
Pull-high
Wake-up
Schmitt Trigger
Bidirectional 8-bit input/output port. Each bit can be config-
ured as a wake-up input by configuration option. Software
instructions determine if the pin is a CMOS output or input.
Configuration options determine if all pins on this port have
pull-high resistors and if the inputs are Schmitt Trigger or
non Schmitt Trigger.
10
I/O Type MCU

Pin Name I/O Configuration
Option Description
PB0/BZ
PB1/BZ
PB2~PB7
I/O Pull-high
I/O or BZ/BZ
Bidirectional 8-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if all pins on this port
have pull-high resistors. Pins PB0 and PB1 are pin-shared
with BZ and BZ, respectively.
PC0/TMR0
PC5/TMR1
PC1~PC4
PC6~PC7
I/O Pull-high
Bidirectional 8-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option determines if all pins on this port
have pull-high resistors. TMR0 and TMR1 are pin-shared
with PC0 and PC5 respectively in the 28-pin package.
PD0~PD7 I/O Pull-high
Bidirectional 8-bit input/output port. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger
input. Configuration options determine if all pins on this
port have pull-high resistors.
PG0/INT I/O Pull-high
Bidirectional 1-bit input/output ports. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger
input. A configuration option determines if the pin has a
pull-high resistor. PG0 is pin-shared with external interrupt
pin INT.
OSC1/PG1
OSC2/PG2
I
O
Pull-high
Crystal or RC or
Int. RC+I/O or
Int. RC+RTC
OSC1, OSC2 are connected to an external RC network or
external Crystal (determined by configurations option) for
the internal system clock. For external RC system clock
operation, OSC2 is an output pin for 1/4 system clock.
These two pins can also be optioned as an RTC oscillator
(32768Hz) or I/O lines. In these two cases, the system
clock comes from an internal RC oscillator whose nominal
frequency at 5V has 4 options, 3.2MHz, 1.6MHz, 800kHz,
400kHz. If the pins are used as normal I/O pins, then
pull-high options are available. If used as oscillator pins,
bits PG1 and PG2 will be free for use by the application
program. In this case the pull-high options are disabled.
RES I ¾Schmitt Trigger reset input. Active low.
VDD ¾¾ Positive power supply
VSS ¾¾ Negative power supply, ground
Note 1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration is
chosen for a particular port, then all input pins on this port will be connected to pull-high resistors.
3. On the 48-pin package Port C has no shared pins. All of Port C pins exist as I/Os as the TMR0
and TMR1 are independent pins.
4. Pins PC6 and PC7 only exist on the 48-pin package.
5. Port D is only present on the 48-pin package.
Chapter 1 Hardware Structure
11

HT48R70A-1/HT48C70-1
Pin Name I/O Configuration
Option Description
PA0~PA7 I/O
Pull-high
Wake-up
Schmitt Trigger
Bidirectional 8-bit input/output port. Each bit can be config-
ured as a wake-up input by configuration option. Software
instructions determine if the pin is a CMOS output or input.
Configuration options determine if all pins on this port have
pull-high resistors and if the inputs are Schmitt Trigger or
non Schmitt Trigger.
PB0/BZ
PB1/BZ
PB2~PB7
PC0~PC7
PD0~PD7
PE0~PE7
PF0~PF7
PG0~PG7
I/O Pull-high
I/O or BZ/BZ
Bidirectional 8-bit input/output ports. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in-
put. A configuration option for each port determines if all pins
on the relevant port have pull-high resistors. Pins PB0 and
PB1 are pin-shared with BZ and BZ respectively.
INT I ¾External interrupt Schmitt Trigger input. Edge triggered on
high to low transition.
TMR0 I ¾Schmitt Trigger input for Timer/Event Counter 0
TMR1 I ¾Schmitt Trigger input for Timer/Event Counter 1
OSC1
OSC2
I
O
Crystal or RC or
Int. RC+RTC
OSC1, OSC2 are connected to an external RC network or
external Crystal (determined by configuration option) for the
internal system clock. For external RC system clock opera-
tion, OSC2 is an output pin for 1/4 system clock.
These two pins also can be optioned as an RTC oscillator
(32768Hz). In this case, the system clock comes from an in-
ternal RC oscillator whose nominal frequency at 5V has 4
options, 3.2MHz, 1.6MHz, 800kHz, 400kHz.
RES I ¾Schmitt Trigger reset input. Active low.
VDD ¾¾ Positive power supply
VSS ¾¾ Negative power supply, ground
Note 1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration is
chosen for a particular port, then all input pins on this port will be connected to pull-high resistors.
3. Pins PE4~PE7 and pins PF4~PF7 only exist on the 64-pin package.
4. Port PG only exists on the 64-pin package.
12
I/O Type MCU