Oki ML63611 User manual

ML63611
User’s Manual
CMOS 4-bit microcontroller
SECOND EDITION
ISSUE DATE: Jun. 2001
1
Preliminary
PEUL63611-02

NOTICE
1. The information contained herein can change without notice owing to product and/or technical improvements.
Before using the product, please make sure that the information being referred to is up-to-date.
2. The outline of action and examples for application circuits described herein have been chosen as an explanation
for the standard action and performance of the product. When planning to use the product, please ensure that the
external conditions are reflected in the actual circuit, assembly, and program designs.
3. When designing your product, please use our product below the specified maximum ratings and within the
specified operating ranges including, but not limited to, operating voltage, power dissipation, and operating
temperature.
4. Oki assumes no responsibility or liability whatsoever for any failure or unusual or unexpected operation resulting
from misuse, neglect, improper installation, repair, alteration or accident, improper handling, or unusual physical
or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or
operation outside the specified operating range.
5. Neither indemnity against nor license of a third party’s industrial and intellectual property right, etc. is granted by
us in connection with the use of the product and/or the information and drawings contained herein. No
responsibility is assumed by us for any infringement of a third party’s right which may result from the use thereof.
6. The products listed in this document are intended for use in general electronics equipment for commercial
applications (e.g., office automation, communication equipment, measurement equipment, consumer electronics,
etc.). These products are not authorized for use in any system or application that requires special or enhanced
quality and reliability characteristics nor in any system or application where the failure of such system or
application may result in the loss or damage of property, or death or injury to humans.
Such applications include, but are not limited to, traffic and automotive equipment, safety devices, aerospace
equipment, nuclear power control, medical equipment, and life-support systems.
7. Certain products in this document may need government approval before they can be exported to particular
countries. The purchaser assumes the responsibility of determining the legality of export of these products and will
take appropriate and necessary steps at their own expense for these.
8. No part of the contents contained herein may be reprinted or reproduced without our prior permission.
Copyright 2001 Oki Electric Industry Co., Ltd.

Preface
This manual describes the hardware of Oki’s original CMOS 4-bit microcontroller ML63611.
Refer to the “nX-4/250, 300 Core Instruction Manual” for details of the 4-bit CPU core nX-4/250 which is built in the
ML63611.
The manuals related to the ML63611 is shown below.
•nX-4/250, 300 Core Instruction Manual:
Describes the base architecture and instruction set of nX-4/250 core and nX-4/300 core.
•SASM63K User’s Manual:
Describes the structured assembler operation and assembler language specification.
•Dr.63611 User’s Manual:
Describes the hardware of the emulator.
•DT63K Debugger User’s Manual:
Describes the debugger commands and the hardware of the simulator.
•MOGTOOL Mask Option Generator User’s Manual:
Describes the mask option settings and the generator operation.
This document is subject to change without notice.

Notation
Classification Notation Description
■Numeric value xxh, xxH Represents a hexadecimal number.
xxb Represents a binary number.
■Unit word, W 1 word = 16 bits
byte, B 1 byte = 2 nibbles = 8 bits
nibble, N 1 nibble = 4 bits
mega-, M 106
kilo-, K 210 = 1024
kilo-, k 103= 1000
milli-, m 10–3
micro-, µ 10–6
nano-, n 10–9
second, s (lower case) second
KB 1 KB = 1 kilobyte = 1024 bytes
MB 1 MB = 1 megabyte = 220 bytes
= 1,048,576 bytes
■Symbol Note: Gives more information about mistakable items.
■Terminology “H” level Indicates high side voltage signal levels VIH and VOH as
specified by the electrical characteristics.
“L” level Indicates low side voltage signal levels VIL and VOL as
specified by the electrical characteristics.
■Register description
Invalid bit : When read, a value of “1” is always obtained. Write operations are invalid.
R/W attribute : “R” indicates data can be read and “W” indicates data can be written.
Bit name
Invalid bit
A
ddress
R/W attribute
Register name
PBF PB1MOD PB0MOD
bit 3 bit 2 bit 1 bit 0
PBMOD (032H)
(R/W)

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ML63611 User’s Manual
Contents
Contents – i
Contents
Chapter 1. Overview 1-1
1.1 Overview.....................................................................................................................................................1-1
1.2 Features.......................................................................................................................................................1-1
1.3 Mask Options..............................................................................................................................................1-5
1.4 Function List...............................................................................................................................................1-7
1.5 Block Diagram............................................................................................................................................1-8
1.6 Pin Configuration......................................................................................................................................1-12
1.6.1 ML63611 Pin Configuration...............................................................................................................1-12
1.7 Pin Descriptions........................................................................................................................................1-15
1.7.1 Descriptions of the Basic Functions of Each Pin ................................................................................1-15
1.7.2 Descriptions of the Secondary Functions of Each Pin.........................................................................1-19
1.7.3 Handling of Unused Pins.....................................................................................................................1-20
1.8 Basic Timing.............................................................................................................................................1-21
1.8.1 Basic Timing of CPU Operation.........................................................................................................1-21
1.8.2 Port I/O Basic Timing.........................................................................................................................1-21
1.8.3 Interrupt Basic Timing........................................................................................................................1-23
Chapter 2. CPU and Memory Spaces 2-1
2.1 Overview.....................................................................................................................................................2-1
2.2 Registers .....................................................................................................................................................2-1
2.2.1 Accumulator (A) ...................................................................................................................................2-1
2.2.2 Flag Register .........................................................................................................................................2-1
2.2.2.1 Carry Flag (C)..................................................................................................................................2-1
2.2.2.2 Zero Flag (Z) ...................................................................................................................................2-2
2.2.2.3 G Flag (G)........................................................................................................................................2-2
2.2.3 Master Interrupt Enable Flag (MIE)......................................................................................................2-2
2.2.4 Current Bank Register (CBR), Extra Bank Register (EBR), HL Register (HL), XY Register (XY)....2-3
2.2.5 Program Counter (PC)...........................................................................................................................2-4
2.2.6 RA Registers (RA3, RA2, RA1, RA0)..................................................................................................2-4
2.2.7 Stack Pointer (SP) and Call Stack.........................................................................................................2-5
2.2.8 Register Stack Pointer (RSP) and Register Stack..................................................................................2-6
2.3 Memory Spaces...........................................................................................................................................2-7
2.3.1 Program Memory Space........................................................................................................................2-7
2.3.2 Data Memory Space..............................................................................................................................2-8
Chapter 3. CPU Control Functions 3-1
3.1 Overview.....................................................................................................................................................3-1
3.2 System Reset Mode (RST)..........................................................................................................................3-2
3.2.1 Transfer to and State of System Reset Mode ........................................................................................3-2
3.3 Halt Mode...................................................................................................................................................3-4
3.3.1 Transfer to and State of Halt Mode.......................................................................................................3-4
3.3.2 Halt Mode Release................................................................................................................................3-5
3.3.2.1 Release of Halt Mode by Interrupt ..................................................................................................3-5
3.3.2.2 Release of Halt Mode by RESET Pin..............................................................................................3-5
3.3.3 Melody Data Interrupt and Halt Mode Release.....................................................................................3-6
3.3.4 Note Concerning HALT Instruction......................................................................................................3-6

ML63611 User’s Manual
Contents
Contents – ii
Chapter 4. Interrupt (INT) 4-1
4.1 Overview.....................................................................................................................................................4-1
4.2 Interrupt Registers.......................................................................................................................................4-3
4.3 Interrupt Sequence....................................................................................................................................4-11
4.3.1 Interrupt Processing.............................................................................................................................4-11
4.3.2 Return from an Interrupt Routine........................................................................................................4-12
4.3.3 Interrupt Hold Instructions..................................................................................................................4-12
Chapter 5. Clock Generator Circuit (OSC) 5-1
5.1 Overview.....................................................................................................................................................5-1
5.2 Clock Generator Circuit Configuration.......................................................................................................5-1
5.3 Low-Speed Clock Generator Circuit...........................................................................................................5-2
5.4 High-Speed Clock Generator Circuit..........................................................................................................5-3
5.5 System Clock Control.................................................................................................................................5-5
5.6 Frequency Control Register (FCON)..........................................................................................................5-6
5.7 System Clock Select Timing.......................................................................................................................5-7
Chapter 6. Time Base Counter (TBC) 6-1
6.1 Overview.....................................................................................................................................................6-1
6.2 Time Base Counter Configuration..............................................................................................................6-1
6.3 Time Base Counter Registers......................................................................................................................6-2
6.4 Time Base Counter Operation.....................................................................................................................6-2
Chapter 7. Timers (TIMER) 7-1
7.1 Overview.....................................................................................................................................................7-1
7.2 Timer Configuration ...................................................................................................................................7-1
7.3 Timer Registers...........................................................................................................................................7-3
7.4 Timer Operation........................................................................................................................................7-14
7.4.1 Timer Clock ........................................................................................................................................7-14
7.4.2 Timer Data Registers...........................................................................................................................7-14
7.4.3 Timer Counter Registers .....................................................................................................................7-14
7.4.4 Timer Interrupt Requests and Overflow Flags....................................................................................7-15
7.4.5 Auto-Reload Mode Operation.............................................................................................................7-16
7.4.6 Capture Mode Operation.....................................................................................................................7-18
7.4.7 Frequency Measurement Mode Operation..........................................................................................7-21
Chapter 8. 100 Hz Timer Counter (100HzTC) 8-1
8.1 Overview.....................................................................................................................................................8-1
8.2 100 Hz Timer Counter Configuration.........................................................................................................8-1
8.3 100 Hz Timer Counter Registers ................................................................................................................8-2
8.4 100 Hz Timer Counter Operation ...............................................................................................................8-3
Chapter 9. Watchdog Timer (WDT) 9-1
9.1 Overview.....................................................................................................................................................9-1
9.2 Watchdog Timer Configuration..................................................................................................................9-1
9.3 Watchdog Timer Control Register (WDTCON).........................................................................................9-2
9.4 Watchdog Timer Operation ........................................................................................................................9-2

ML63611 User’s Manual
Contents
Contents – iii
Chapter 10. Ports (INPUT, I/O PORT) 10-1
10.1 Overview...................................................................................................................................................10-1
10.2 Ports List...................................................................................................................................................10-1
10.3 Port 0 (P0.0–P0.3).....................................................................................................................................10-2
10.3.1 Port 0 Configuration............................................................................................................................10-2
10.3.2 Port 0 Registers ...................................................................................................................................10-2
10.3.3 Port 0 External Interrupt Function (External Interrupt 5)....................................................................10-5
10.4 Port A (PA.0–PA.3)..................................................................................................................................10-7
10.4.1 Port A Configuration...........................................................................................................................10-7
10.4.2 Port A Registers ..................................................................................................................................10-8
10.5 Port B (PB.0–PB.3).................................................................................................................................10-11
10.5.1 Port B Configuration.........................................................................................................................10-11
10.5.2 Port B Registers.................................................................................................................................10-12
10.5.3 Port B External Interrupt Function (External Interrupt 0).................................................................10-17
10.6 Port C (PC.0–PC.3).................................................................................................................................10-19
10.6.1 Port C Configuration.........................................................................................................................10-19
10.6.2 Port C Registers.................................................................................................................................10-20
10.6.3 Port C External Interrupt Function (External Interrupt 1).................................................................10-25
10.7 Port E (PE.0–PE.3) .................................................................................................................................10-27
10.7.1 Port E Configuration .........................................................................................................................10-27
10.7.2 Port E Registers.................................................................................................................................10-28
10.7.3 Port E.3 External Interrupt Function (External Interrupt 2)..............................................................10-31
Chapter 11. Melody Driver (MELODY) 11-1
11.1 Overview...................................................................................................................................................11-1
11.2 Melody Driver Configuration ...................................................................................................................11-1
11.3 Melody Driver Registers...........................................................................................................................11-2
11.4 Melody Circuit Operation.........................................................................................................................11-4
11.4.1 Tempo Data.........................................................................................................................................11-5
11.4.2 Melody Data........................................................................................................................................11-6
11.4.3 Melody Circuit Application Example .................................................................................................11-9
11.5 Buzzer Circuit Operation........................................................................................................................11-10
Chapter 12. Serial Port (SIO) 12-1
12.1 Overview...................................................................................................................................................12-1
12.2 Serial Port Configuration..........................................................................................................................12-1
12.3 Serial Port Registers..................................................................................................................................12-3
12.4 Serial Port Operation Description...........................................................................................................12-12
12.4.1 Data Format.......................................................................................................................................12-12
12.4.2 Send Operation Description ..............................................................................................................12-13
12.4.3 Receive Operation Description .........................................................................................................12-19
12.5 Send/Receive Data LSB/MSB First Select.............................................................................................12-25
12.5.1 Selecting Send Data LSB/MSB First ................................................................................................12-25
12.5.2 Selecting Receive Data LSB/MSB First............................................................................................12-26
Chapter 13. LCD Driver (LCD) 13-1
13.1 Overview...................................................................................................................................................13-1
13.2 LCD Driver Configuration........................................................................................................................13-2
13.3 LCD Driver Registers...............................................................................................................................13-7
13.4 LCD Driver Operation............................................................................................................................13-10
13.5 Output Port Selection by Mask Option...................................................................................................13-11
13.6 Bias Generator Circuit (BIAS)................................................................................................................13-12
13.7 LCD Driver Output Waveform...............................................................................................................13-17

ML63611 User’s Manual
Contents
Contents – iv
Chapter 14. Battery Low Detect Circuit (BLD) 14-1
14.1 Overview...................................................................................................................................................14-1
14.2 Battery Low Detect Circuit Configuration................................................................................................14-1
14.3 Judgment Voltage .....................................................................................................................................14-2
14.4 Battery Low Detect Circuit Register.........................................................................................................14-2
14.5 Battery Low Detect Circuit Operation......................................................................................................14-3
Chapter 15. Power Supply Circuit (POWER) 15-1
15.1 Overview...................................................................................................................................................15-1
15.1.1 Precautions in Using the Halver Circuit..............................................................................................15-1
15.2 Power Supply Circuit Related Register ....................................................................................................15-2
15.3 Power Supply Circuit Configuration.........................................................................................................15-3
15.3.1 OPTION A Power Supply Circuit Configuration................................................................................15-3
15.3.2 Operation of the OPTION A Power Supply Circuit............................................................................15-4
15.3.3 OPTION B Power Supply Circuit Configuration................................................................................15-5
15.3.4 Operation of the OPTION B Power Supply Circuit............................................................................15-6
15.3.5 OPTION C Power Supply Circuit Configuration................................................................................15-7
15.3.6 Operation of the OPTION C Power Supply Circuit............................................................................15-8
15.3.7 OPTION D Power Supply Circuit Configuration................................................................................15-9
15.3.8 Operation of the OPTION D Power Supply Circuit..........................................................................15-10
Chapter 16. A/D Converter (ADC) 16-1
16.1 Overview...................................................................................................................................................16-1
16.2 A/D Converter Configuration ...................................................................................................................16-2
16.3 Operation of A/D Converter .....................................................................................................................16-3
16.3.1 RC Oscillation Circuit.........................................................................................................................16-4
16.3.2 Counter A/B Reference Mode.............................................................................................................16-7
16.3.3 Example of Usage of A/D Converter................................................................................................16-11
16.3.4 RC Oscillation Monitor.....................................................................................................................16-17
16.4 Registers Related to A/D Converter........................................................................................................16-18
Appendixes
Appendix A List of Special Function Registers .................................................................................Appendix-1
Appendix B Input/Output Circuit Configuration................................................................................... Appendix-5
Appendix C Peripheral Circuit Examples.............................................................................................. Appendix-7
Appendix D Instruction List ................................................................................................................Appendix-11

Chapter 1
Overview

ML63611 User’s Manual
Chapter 1 Overview
1 – 1 OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
1. Overview
1.1 Overview
The ML63611 is a CMOS 4-bit microcontroller using Oki’s original CPU core nX-4/250.
The ML63611 is provided with the mask options of eight items of selection including (1.5 V or 3.0 V) power
supply specifications and (With or Without) the regulator circuit for the LCD bias reference voltage.
When a 3.0 V power supply specificaiton is selected, the halver circuit can be used to decrease power
consumption. The halver circuit cannot be used when a 1.5 V power supply specification is selected.
When “With the regulator circuit for the LCD bias reference voltage” is selected, the LCD bias reference voltage
will be generated based on the output voltage of the regulator circuit. When “Without the regulator circuit for the
LCD bias reference voltage” is selected, the LCD bias reference voltage will be generated based on the power
supply voltage; for this reason, the LCD bias voltage decreases as the power supply voltage decreases, causing the
display density of the LCD panel to thin down.
The ML63611 has incorporated in it an 8K-word program memory, a 1K-nibble data memory, four input ports,
four output ports (only when the mask option of LCD driver pins is selected), 16 I/O ports, a melody circuit, a
serial port, four 8-bit timers, and a 64-segment LCD driver (60 segment lines and 4 common lines, max.). (A
part of the SEG pins can also be selected as output port pins or COM pins depending on the mask option.)
Note:
In this manual, for convenience of description, the symbols OPTION A, OPTION B, OPTION C, and OPTION D are
used in accordance with the mask option selection of a power supply specification (1.5 V or 3.0 V) and the regulator
circuit for the LCD bias reference voltage (With or Without), as shown below.
•OPTION A: 1.5 V power supply specification (halver circuit disabled), without the regulator circuit for the LCD
bias reference voltage
•OPTION B: 1.5 V power supply specification (halver circuit disabled), with the regulator circuit for the LCD bias
reference voltage
•OPTION C: 3.0 V power supply specification (halver circuit enabled), without the regulator circuit for the LCD
bias reference voltage
•OPTION D: 3.0 V power supply specification (halver circuit enabled), with the regulator circuit for the LCD bias
reference voltage
1.2 Features
The ML63611 has the following features.
a. Extensive instruction set
•407 instructions
Transfer, rotate, increment/decrement, arithmetic operations, compare, logic operations, mask
operations, bit operations, ROM table reference, stack operations, flag operations, jump, conditional
branch, call/return, control
b. Wide variety of addressing modes
•Indirect addressing mode for 4 types of data memory with current bank register, extra bank register, HL
register and XY register
•Data memory bank internal direct addressing mode
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