Cypress Semiconductor CY7C63413C User manual

Low-SpeedHighI/O,1.5-MbpsUSBControlle
r
CY7C63413C
CY7C63513C
CY7C63613C
Cypress Semiconductor Corporation • 198ChampionCourt • San Jose,CA 95134-1709 • 408-943-2600
Document #: 38-08027 Rev. *B Revised January 6, 2006
Features
• Low-costsolutionforlow-speedapplicationswithhigh
I/O requirements such as keyboards, keyboards with
integrated pointing device, gamepads, and many
others
• USB Specification Compliance
— Conforms toUSB Specification, Versions 1.1 and2.0
— Conforms to USB HID Specification, Version 1.1
— Supports 1 device address and 3 data endpoints
— Integrated USB transceiver
• 8-bit RISC microcontroller
— Harvard architecture
— 6-MHz external ceramic resonator
— 12-MHz internal CPU clock
• Internal memory
— 256 bytes of RAM
— 8 Kbytes of EPROM
• Interface can auto-configure to operate as PS2 or USB
•I/Oport
— TheCY7C63413C/513Chave24 GeneralPurpose I/O
(GPIO) pins (Port 0 to 2) capable of sinking 7 mA per
pin (typical)
— TheCY7C63613Chas12GeneralPurposeI/O(GPIO)
pins (Port 0 to 2) capable of sinking 7 mA per pin
(typical)
— The CY7C63413C/513C have eight GPIO pins (Port
3) capable of sinking 12 mA per pin (typical) which
can drive LEDs
— TheCY7C63613ChasfourGPIOpins(Port3)capable
of sinking 12 mA per pin (typical) which can drive
LEDs
— Higher current drive is available by connecting
multiple GPIO pins together to drive a common
output
— Each GPIO port can be configured as inputs with
internal pull-ups or open drain outputs or traditional
CMOS outputs
— The CY7C63513C has an additional eight I/O pins on
a DAC port which has programmable current sink
outputs
— Maskable interrupts on all I/O pins
• 12-bit free-running timer with one microsecond clock
ticks
• Watch Dog Timer (WDT)
• Internal Power-On Reset (POR)
• Improved output drivers to reduce EMI
• Operating voltage from 4.0V to 5.5V DC
• Operating temperature from 0 to 70 degrees Celsius
• CY7C63413C available in 40-pin PDIP, 48-pin SSOP, 48-
pin SSOP - Tape reel, all in Lead-Free versions for
production
• CY7C63513C available in 48-pin SSOP Lead-Free
packages for production
• CY7C63613C available in 24-pin SOIC Lead-Free
packages for production
• Industry-standard programmer support
Functional Overview
The CY7C63413C/513C/613C are 8-bit RISC One Time
Programmable(OTP)microcontrollers.The instructionsethas
been optimized specifically for USB operations, although the
microcontrollers can be used for a variety of non-USB
embedded applications.
The CY7C63413C/513C features 32 General-Purpose I/O
(GPIO) pins to support USB and other applications. The I/O
pins are grouped into four ports (Port 0 to 3) where each port
can be configured as inputs with internal pull-ups, open drain
outputs,ortraditionalCMOS outputs.The CY7C63413C/513C
have 24 GPIO pins (Ports 0 to 2) that are rated at 7 mA typical
sink current. The CY7C63413C/513C has 8 GPIO pins (Port
3) that are rated at 12 mA typical sink current, which allows
these pins to drive LEDs.
The CY7C63613C features 16 General-Purpose I/O (GPIO)
pins to support USB and other applications. The I/O pins are
grouped into four ports (Port 0 to 3) where each port can be
configured as inputs with internal pull-ups, open drain outputs,
or traditional CMOS outputs. The CY7C63613C has 12 GPIO
pins (Ports 0 to 2) that are rated at 7 mA typical sink current.
The CY7C63613C has 4 GPIO pins (Port 3) that are rated at
12 mA typical sink current, which allows these pins to drive
LEDs.
Multiple GPIO pins can be connected together to drive a single
output for more drive current capacity. Additionally, each I/O
pin can be used to generate a GPIO interrupt to the microcon-
troller. Note the GPIO interrupts all share the same “GPIO”
interrupt vector.
The CY7C63513C features an additional 8 I/O pins in the DAC
port. Every DAC pin includes an integrated 14-Kohm pull-up
resistor. When a “1” is written to a DAC I/O pin, the output
current sink is disabled and the output pin is driven high by the
internal pull-up resistor. When a “0” is written to a DAC I/O pin,
the internal pull-up is disabled and the output pin provides the
programmed amount ofsink
current. A DAC I/O pin can
be used as an input with an
internal pull-up by writing a
“1” to the pin.
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Document #: 38-08027 Rev. *B Page 2 of 32
The sink current for each DAC I/O pin can be individually
programmed to one of sixteen values using dedicated Isink
registers. DAC bits [1:0] can be used as high current outputs
with a programmable sink current range of 3.2 to 16 mA
(typical). DAC bits [7:2] have a programmable current sink
range of 0.2 to 1.0 mA (typical). Again, multiple DAC pins can
be connected together to drive a single output that requires
more sink current capacity. Each I/O pin can be used to
generate a DAC interrupt to the microcontroller and the
interrupt polarity for each DAC I/O pin is individually program-
mable. The DAC port interrupts share a separate “DAC”
interrupt vector.
The Cypress microcontrollers use an external 6-MHz ceramic
resonator to provide a reference to an internal clock generator.
This clock generator reduces the clock-related noise
emissions (EMI). The clock generator provides the 6 and 12-
MHz clocks that remain internal to the microcontroller.
TheCY7C63413C/513C/613C are offeredwith singleEPROM
options. The CY7C63413C, CY7C63513C and the
CY7C63613C have 8 Kbytes of EPROM.
ThesepartsincludePower-onResetlogic,aWatchDogTimer,
a vectored interrupt controller, and a 12-bit free-running timer.
The Power-On Reset (POR) logic detects when power is
applied to the device, resets the logic to a known state, and
begins executinginstructions atEPROM address 0x0000. The
Watch Dog Timer can be used to ensure the firmware never
gets stalled for more than approximately 8 ms. The firmware
can get stalled for a variety of reasons, including errors in the
code or a hardware failure such as waiting for an interrupt that
never occurs. The firmware should clear the Watch Dog Timer
periodically. If the Watch Dog Timer is not cleared for approx-
imately 8 ms, the microcontroller will generate a hardware
watch dog reset.
The microcontroller supports eight maskable interrupts in the
vectoredinterruptcontroller.Interrupt sourcesinclude theUSB
Bus-Reset, the 128-µs and 1.024-ms outputs from the free-
running timer, three USB endpoints, the DAC port, and the
GPIOports.Thetimerbitscausean interrupt (ifenabled)when
the bit toggles from LOW “0” to HIGH “1.” The USB endpoints
interrupt after either the USB host or the USB controller sends
a packet to the USB. The DAC ports have an additional level
of masking that allows the user to select which DAC inputs can
cause a DAC interrupt. The GPIO ports also have a level of
masking to select which GPIO inputs can cause a GPIO
interrupt. For additional flexibility, the input transition polarity
that causes an interrupt is programmable for each pin of the
DAC port. Input transition polarity can be programmed for
each GPIO port as part of the port configuration. The interrupt
polarity can be either rising edge (“0” to “1”) or falling edge (“1”
to “0”).
The free-running 12-bit timer clocked at 1 MHz provides two
interrupt sources as noted above (128-µs and 1.024-ms). The
timer can be used to measure the duration of an event under
firmware control by reading the timer twice: once at the start
of the event, and once after the event is complete. The
difference between the two readings indicates the duration of
the event measured in microseconds. The upper four bits of
the timer are latched into an internal register when the
firmware reads the lower eight bits. A read from the upper four
bitsactually reads datafrom the internalregister, instead ofthe
timer. This feature eliminates the need for firmware to attempt
to compensate if the upper four bits happened to increment
right after the lower 8 bits are read.
The CY7C63413C/513C/613C include an integrated USB
serial interface engine (SIE) that supports the integrated
peripherals. The hardware supports one USB device address
with three endpoints. The SIE allows the USB host to commu-
nicate with the function integrated into the microcontroller.
Finally, the CY7C63413C/513C/613C support PS/2 operation.
With appropriate firmware the D+ and D– USB pins can also
be used as PS/2 clock and data signals. Products utilizing
these devices can be used for USB and/or PS/2 operation with
appropriate firmware.
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Document #: 38-08027 Rev. *B Page 3 of 32
.
Note:
1. CY7C63613C is not bonded out for all GPIO pins shown in Logic Block Diagram. Refer to pin configuration diagram for bonded out pins. See note on page 12
for firmware code needed for unused GPIO pins.
Logic Block Diagram
Interrupt
Controller
EPROM
12-bit
Timer
Reset
Watch Dog
Timer
Power-on
GPIO
PORT 1
GPIO
PORT 0
P0[0]
P0[7]
P1[0]
P1[7]
8-bit Bus
6-MHz ceramic resonator
RAM
USB
SIE
USB
Transceiver D+
D–
USB
GPIO
PORT 3
GPIO
PORT 2
P2[0]
P2[7]
P3[0]
P3[7]
DAC
PORT
DAC[0]
DAC[7]
High Current
Outputs
256 byte
4/6/8 Kbyte
OSC
6 MHz
12-MHz
8-bit
CPU
12 MHz
Pin Configuration
PS/2
PORT
CY7C63413C
1
2
3
4
5
6
7
9
11
12
13
14
15
16
18
17
D–
10
8
19
20
31
30
29
33
32
35
34
37
36
39
38
40
25
27
26
28
V
CC
V
SS
P3[6]
P3[4]
P3[2]
P3[0]
P2[6]
P2[4]
P3[7]
P3[5]
P3[3]
P3[1]
P2[7]
P2[5]
P2[3]
P2[1]
P1[7]
P1[5]
P1[3]
P1[1]
P0[7]
P0[5]
P0[3]
P0[1]
V
PP
Vss
D+
P2[2]
P2[0]
P1[6]
P1[4]
P1[2]
P1[0]
P0[6]
P0[4]
P0[2]
P0[0]
XTAL
OUT
XTAL
IN
40-pin PDIP
1
2
3
4
5
6
7
9
11
12
13
14
15
16
18
17
D–
10
8
19
20
31
30
29
33
32
35
34
37
36
39
38
41
40
43
42
45
44
46
48
47
21
22
23
24 25
27
26
28
VCC
Vss
P3[6]
P3[4]
P3[2]
P3[0]
P2[6]
P2[4]
P3[7]
P3[5]
P3[3]
P3[1]
P2[7]
P2[5]
P2[3]
P2[1]
P1[7]
P1[5]
P1[3]
P1[1]
NC
NC
P0[7]
P0[5]
P0[3]
P0[1]
NC
NC
VPP
Vss
D+
P2[2]
P2[0]
P1[6]
P1[4]
P1[2]
P1[0]
NC
NC
P0[6]
P0[4]
P0[2]
P0[0]
NC
NC
XTALOUT
XTALIN
CY7C63513C
1
2
3
4
5
6
7
9
11
12
13
14
15
16
18
17
D–
10
8
19
20
31
30
29
33
32
35
34
37
36
39
38
41
40
43
42
45
44
46
48
47
21
22
23
24 25
27
26
28
VCC
Vss
P3[6]
P3[4]
P3[2]
P3[0]
P2[6]
P2[4]
P3[7]
P3[5]
P3[3]
P3[1]
P2[7]
P2[5]
P2[3]
P2[1]
P1[7]
P1[5]
P1[3]
P1[1]
DAC[7]
DAC[5]
P0[7]
P0[5]
P0[3]
P0[1]
DAC[3]
DAC[1]
VPP
Vss
D+
P2[2]
P2[0]
P1[6]
P1[4]
P1[2]
P1[0]
DAC[6]
DAC[4]
P0[6]
P0[4]
P0[2]
P0[0]
DAC[2]
DAC[0]
XTALOUT
XTALIN
21
23
22
24
CY7C63413C
48-pin SSOP
48-pin SSOP
D+
D–
P3[7]
P3[3]
P3[5]
P3[1]
P2[5]
P2[3]
P2[1]
P1[7]
P1[5]
P1[3]
P1[1]
P2[7]
DAC[3] DAC[1]
V
PP
Vss
XTAL
OUT
XTAL
IN
DAC[7]
DAC[5]
P0[7]
P0[5]
P0[3]
P0[1]
DAC[6]
DAC[4]
P0[6]
P0[4]
P0[2] P0[0]
DAC[2]
DAC[0] V
CC
Vss
P3[6]
P3[4]
P3[2]
P3[0]
P2[6]
P2[4]
P2[2]
P2[0]
P1[6]
P1[4]
P1[2]
P1[0]
CY7C63413C
48-Pad Die
0
0
CY7C63613C
1
2
3
4
5
6
7
9
11
12
D–
10
8
15
14
13
17
16
19
18
21
20
23
22
24 V
CC
V
SS
P3[6]
P3[4]
P1[2]
P1[0]
P0[6]
P0[4]
P3[7]
P3[5]
P1[3]
P1[1]
P0[7]
P0[5]
P0[3]
P0[1]
V
PP
Vss
D+
P0[2]
P0[0]
XTAL
OUT
XTAL
IN
24-pin SOIC
CY7C63513C only
See Note 1
.
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Document #: 38-08027 Rev. *B Page 4 of 32
Programming Model
14-bit Program Counter (PC)
The 14-bit Program Counter (PC) allows access for up to 8
kilobytes of EPROM using the CY7C63413C/513C/613C
architecture. The program counter is cleared during reset,
such that the first instruction executed after a reset is at
address 0x0000. This is typically a jump instruction to a reset
handler that initializes the application.
The lower eight bits of the program counter are incremented
as instructions are loaded and executed. The upper six bits of
the program counter are incremented by executing an XPAGE
instruction. As a result, the last instruction executed within a
256-byte “page” of sequential code should be an XPAGE
instruction. The assembler directive “XPAGEON” will cause
the assembler to insert XPAGE instructions automatically. As
instructions can be either one or two bytes long, the assembler
may occasionally need to insert a NOP followed by an XPAGE
for correct execution.
The program counter of the next instruction to be executed,
carryflag, and zeroflagaresavedas twobyteson theprogram
stack during an interrupt acknowledge or a CALL instruction.
The program counter, carry flag, and zero flag are restored
from the program stack only during a RETI instruction.
Please note the program counter cannot be accessed directly
by the firmware. The program stack can be examined by
reading SRAM from location 0x00 and up.
8-bit Accumulator (A)
The accumulator is the general purpose, do everything
register in the architecture where results are usually calcu-
lated.
8-bit Index Register (X)
The index register “X” is available to the firmware as an
auxiliaryaccumulator. TheXregister alsoallowsthe processor
to perform indexed operations by loading an index value into
X.
8-bit Program Stack Pointer (PSP)
During a reset, the Program Stack Pointer (PSP) is set to zero.
This means the program “stack” starts at RAM address 0x00
and “grows” upward from there. Note the program stack
pointer is directly addressable under firmware control, using
the MOV PSP,A instruction. The PSP supports interrupt
service under hardware control and CALL, RET, and RETI
instructions under firmware control.
Pin Definitions
Name I/O CY7C63413C CY7C63513C CY7C63613C Description40-Pin 48-Pin Die 48-Pin 24-Pin
D+, D– I/O 1,2 1,2 1,2 1,2 1,2 USB differential data; PS/2 clock and
data signals
P0[7:0] I/O 15,26,16
25,17,24
18,23
17,32,18
31,19,30
20,29
17,32,18,
31,19,30,
20,29
17,32,18,31,
19,30,20,29 7,18,8,17,9, 16, 10, 15 GPIO port 0 capable of sinking 7 mA (typical)
P1[3:0] I/O 11,30,12,
29,13,28,
14,27
11,38,12,
37,13,36,
14,35
11,38,12,
37,13,36,
14,35
11,38,12,37,
13,36,14,35 5, 20, 6, 19 GPIO Port 1 capable of sinking 7 mA (typical).
P2 I/O 7,34,8,
33,9,32,
10,31
7,42,8,
41,9,40,
10,39
7,42,8,
41,9,40,
10,39
7,42,8,41,9,
40,10,39 n/a GPIO Port 2 capable of sinking 7 mA (typical).
P3[7:4] I/O 3,38,4,
37,5,36,
6,35
3,46,4,
45,5,44,
6,43
3,46,4,
45,5,44,
6,43
3,46,4,45,5,
44,6,43 3, 22, 4, 21 GPIO Port 3 capable of sinking 12 mA (typical).
DAC I/O n/a n/a 15,34,16,
33,21,28,
22,27
15,34,16,33,
21,28,22,27 n/a DAC I/O Port with programmable current sink outputs. DAC[1:0] offer a
programmable range of 3.2 to 16 mA
typical. DAC[7:2] have a program-
mable sink current range of 0.2 to 1.0
mA typical. DAC I/O Port not bonded
out on CY7C63613C. See note on
page 12 for firmware code needed for
unused pins.
XTALIN IN 21 25 25 25 13 6-MHz ceramic resonator or external
clock input
XTALOUT OUT 22 26 26 26 14 6-MHz ceramic resonator
VPP 19 23 23 23 11 Programming voltage supply, ground
during operation
VCC 40 48 48 48 24 Voltage supply
Vss 20,39 24,47 24,47 24,47 12, 23 Ground
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Document #: 38-08027 Rev. *B Page 5 of 32
During an interrupt acknowledge, interrupts are disabled and
the 14-bit program counter, carry flag, and zero flag are written
as two bytes of data memory. The first byte is stored in the
memory addressed by the program stack pointer, then the
PSP is incremented. The second byte is stored in memory
addressed by the program stack pointer and the PSP is incre-
mented again. The net effect is to store the program counter
and flags on the program “stack” and increment the program
stack pointer by two.
The Return From Interrupt (RETI) instruction decrements the
program stack pointer, then restores the second byte from
memory addressed by the PSP. The program stack pointer is
decremented again and the first byte is restored from memory
addressed by the PSP. After the program counter and flags
havebeenrestored from stack,theinterruptsare enabled. The
effect is to restore the program counter and flags from the
program stack, decrement the program stack pointer by two,
and re-enable interrupts.
The Call Subroutine (CALL) instruction stores the program
counter and flags on the program stack and increments the
PSP by two.
The Return From Subroutine (RET) instruction restores the
program counter, but not the flags, from program stack and
decrements the PSP by two.
8-bit Data Stack Pointer (DSP)
The Data Stack Pointer (DSP) supports PUSH and POP
instructions that use the data stack for temporary storage. A
PUSH instruction will pre-decrement the DSP, then write data
to the memory location addressed by the DSP. A POP
instruction will read data from the memory location addressed
by the DSP, then post-increment the DSP.
During a reset, the Data Stack Pointer will be set to zero. A
PUSH instruction when DSP equal zero will write data at the
top of the data RAM (address 0xFF). This would write data to
the memory area reserved for a FIFO for USB endpoint 0. In
non-USB applications, this works fine and is not a problem.
For USB applications, it is strongly recommended that the
DSP is loaded after reset just below the USB DMA buffers.
Address Modes
The CY7C63413C/513C/613C microcontrollers support three
addressing modes for instructions that require data operands:
data, direct, and indexed.
Data
The “Data” address mode refers to a data operand that is
actually a constant encoded in the instruction. As an example,
consider the instruction that loads A with the constant 0xE8:
• MOV A,0E8h
This instruction will require two bytes of code where the first
byte identifies the “MOV A” instruction with a data operand as
the second byte. The second byte of the instruction will be the
constant “0xE8”. A constant may be referred to by name if a
prior “EQU” statement assigns the constant value to the name.
For example, the following code is equivalent to the example
shown above:
• DSPINIT: EQU 0E8h
• MOV A,DSPINIT
Direct
“Direct” address mode is used when the data operand is a
variable stored in SRAM. In that case, the one byte address of
the variable is encoded in the instruction. As an example,
consider an instruction that loads A with the contents of
memory address location 0x10:
• MOV A, [10h]
In normal usage, variable names are assigned to variable
addresses using “EQU” statements to improve the readability
of the assembler source code. As an example, the following
code is equivalent to the example shown above:
• buttons: EQU 10h
• MOV A,[buttons]
Indexed
“Indexed” address mode allows the firmware to manipulate
arrays of data stored in SRAM. The address of the data
operand is the sum of a constant encoded in the instruction
and the contents of the “X” register. In normal usage, the
constant will be the “base” address of an array of data and the
X register will contain an index that indicates which element of
the array is actually addressed:
• array: EQU 10h
•MOVX,3
• MOV A,[x+array]
This would have the effect of loading A with the fourth element
of the SRAM “array” that begins at address 0x10. The fourth
element would be at address 0x13.
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Instruction Set Summary
MNEMONIC operand opcode cycles MNEMONIC operand opcode cycles
HALT 00 7 NOP 20 4
ADD A,expr data 01 4 INC A acc 21 4
ADD A,[expr] direct 02 6 INC X x 22 4
ADD A,[X+expr] index 03 7 INC [expr] direct 23 7
ADC A,expr data 04 4 INC [X+expr] index 24 8
ADC A,[expr] direct 05 6 DEC A acc 25 4
ADC A,[X+expr] index 06 7 DEC X x 26 4
SUB A,expr data 07 4 DEC [expr] direct 27 7
SUB A,[expr] direct 08 6 DEC [X+expr] index 28 8
SUB A,[X+expr] index 09 7 IORD expr address 29 5
SBB A,expr data 0A 4 IOWR expr address 2A 5
SBB A,[expr] direct 0B 6 POP A 2B 4
SBB A,[X+expr] index 0C 7 POP X 2C 4
OR A,expr data 0D 4 PUSH A 2D 5
OR A,[expr] direct 0E 6 PUSH X 2E 5
OR A,[X+expr] index 0F 7 SWAP A,X 2F 5
AND A,expr data 10 4 SWAP A,DSP 30 5
AND A,[expr] direct 11 6 MOV [expr],A direct 31 5
AND A,[X+expr] index 12 7 MOV [X+expr],A index 32 6
XOR A,expr data 13 4 OR [expr],A direct 33 7
XOR A,[expr] direct 14 6 OR [X+expr],A index 34 8
XOR A,[X+expr] index 15 7 AND [expr],A direct 35 7
CMP A,expr data 16 5 AND [X+expr],A index 36 8
CMP A,[expr] direct 17 7 XOR [expr],A direct 37 7
CMP A,[X+expr] index 18 8 XOR [X+expr],A index 38 8
MOV A,expr data 19 4 IOWX [X+expr] index 39 6
MOV A,[expr] direct 1A 5 CPL 3A 4
MOV A,[X+expr] index 1B 6 ASL 3B 4
MOV X,expr data 1C 4 ASR 3C 4
MOV X,[expr] direct 1D 5 RLC 3D 4
reserved 1E RRC 3E 4
XPAGE 1F 4 RET 3F 8
MOV A,X 40 4 DI 70 4
MOV X,A 41 4 EI 72 4
MOV PSP,A 60 4 RETI 73 8
CALL addr 50-5F 10
JMP addr 80-8F 5 JC addr C0-CF 5
CALL addr 90-9F 10 JNC addr D0-DF 5
JZ addr A0-AF 5 JACC addr E0-EF 7
JNZ addr B0-BF 5 INDEX addr F0-FF 14
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Document #: 38-08027 Rev. *B Page 7 of 32
Memory Organization
Program Memory Organization
after reset Address
14-bit PC 0x0000 Program execution begins here after a reset
0x0002 USB Bus Reset interrupt vector
0x0004 128-µs timer interrupt vector
0x0006 1.024-ms timer interrupt vector
0x0008 USB address A endpoint 0 interrupt vector
0x000A USB address A endpoint 1 interrupt vector
0x000C USB address A endpoint 2 interrupt vector
0x000E Reserved
0x0010 Reserved
0x0012 Reserved
0x0014 DAC interrupt vector
0x0016 GPIO interrupt vector
0x0018 Reserved
0x001A Program Memory begins here
(8K - 32 bytes)
0x1FDF 8-KB PROM ends here (CY7C63413C, CY7C63513C, CY7C63613C)
Figure 1. Program Memory Space with Interrupt Vector Table
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CY7C63413C
CY7C63513C
CY7C63613C
Document #: 38-08027 Rev. *B Page 8 of 32
Data Memory Organization
The CY7C63413C/513C/613C microcontrollers provide 256
bytes of data RAM. In normal usage, the SRAM is partitioned
into four areas: program stack, data stack, user variables and
USB endpoint FIFOs as shown below:
after reset Address
8-bit PSP 0x00 Program Stack begins here and grows upward
8-bit DSP user Data Stack begins here and grows downward
The user determines the amount of memory required
User Variables
0xE8 USB FIFO for Address A endpoint 2
0xF0 USB FIFO for Address A endpoint 1
0xF8 USB FIFO for Address A endpoint 0
Top of RAM Memory 0xFF
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CY7C63413C
CY7C63513C
CY7C63613C
Document #: 38-08027 Rev. *B Page 9 of 32
I/O Register Summary
I/O registers are accessed via the I/O Read (IORD) and I/O
Write (IOWR, IOWX) instructions. IORD reads the selected
port into the accumulator. IOWR writes data from the accumu-
lator to the selected port. Indexed I/O Write (IOWX) adds the
contents of X to the address in the instruction to form the port
address and writes data from the accumulator to the specified
port. Note that specifying address 0 (e.g., IOWX 0h) means
the I/O port is selected solely by the contents of X.
Table 1. I/O Register Summary
Register Name I/O Address Read/Write Function
Port 0 Data 0x00 R/W GPIO Port 0
Port 1 Data 0x01 R/W GPIO Port 1
Port 2 Data 0x02 R/W GPIO Port 2
Port 3 Data 0x03 R/W GPIO Port 3
Port 0 Interrupt Enable 0x04 W Interrupt enable for pins in Port 0
Port 1 Interrupt Enable 0x05 W Interrupt enable for pins in Port 1
Port 2 Interrupt Enable 0x06 W Interrupt enable for pins in Port 2
Port 3 Interrupt Enable 0x07 W Interrupt enable for pins in Port 3
GPIO Configuration 0x08 R/W GPIO Ports Configurations
USB Device Address A 0x10 R/W USB Device Address A
EP A0 Counter Register 0x11 R/W USB Address A, Endpoint 0 counter register
EP A0 Mode Register 0x12 R/W USB Address A, Endpoint 0 configuration register
EP A1 Counter Register 0x13 R/W USB Address A, Endpoint 1 counter register
EP A1 Mode Register 0x14 R/C USB Address A, Endpoint 1 configuration register
EP A2 Counter Register 0x15 R/W USB Address A, Endpoint 2 counter register
EP A2 Mode Register 0x16 R/C USB Address A, Endpoint 2 configuration register
USB Status & Control 0x1F R/W USB upstream port traffic status and control register
Global Interrupt Enable 0x20 R/W Global interrupt enable register
Endpoint Interrupt Enable 0x21 R/W USB endpoint interrupt enables
Timer (LSB) 0x24 R Lower eight bits of free-running timer (1 MHz)
Timer (MSB) 0x25 R Upper four bits of free-running timer that are latched
when the lower eight bits are read.
WDR Clear 0x26 W Watch Dog Reset clear
DAC Data 0x30 R/W DAC I/O[2]
DAC Interrupt Enable 0x31 W Interrupt enable for each DAC pin
DAC Interrupt Polarity 0x32 W Interrupt polarity for each DAC pin
DAC Isink 0x38-0x3F W One four bit sink current register for each DAC pin
Processor Status & Control 0xFF R/W Microprocessor status and control
Note:
2. DAC I/O Port not bonded out on CY7C63613C. See note on page 12 for firmware code needed for unused GPIO pins.
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CY7C63513C
CY7C63613C
Document #: 38-08027 Rev. *B Page 10 of 32
Clocking
The XTALIN and XTALOUT are the clock pins to the microcon-
troller. The user can connect a low-cost ceramic resonator or
an external oscillator can be connected to these pins to
provide areference frequency for theinternalclock distribution
and clock doubler.
An external 6-MHz clock can be applied to the XTALIN pin if
the XTALOUT pin is left open. Please note that grounding the
XTALOUT pin is not permissible as the internal clock is effec-
tively shorted to ground.
Reset
The USB Controller supports three types of resets. All
registers are restored to their default states during a reset. The
USB Device Addresses are set to 0 and all interrupts are
disabled. In addition, the Program Stack Pointer (PSP) and
Data Stack Pointer (DSP) are set to 0x00. For USB applica-
tions, the firmware should set the DSP below 0xE8 to avoid a
memory conflict with RAM dedicated to USB FIFOs. The
assembly instructions to do this are shown below:
Mov A, E8h ; Move 0xE8 hex into Accumulator
Swap A,dsp ; Swap accumulator value into dsp register
The three reset types are:
1. Power-On Reset (POR)
2. Watch Dog Reset (WDR)
3. USB Bus Reset (non hardware reset)
The occurrence of a reset is recorded in the Processor Status
and Control Register located at I/O address 0xFF. Bits 4, 5,
and 6 are used to record the occurrence of POR, USB Reset,
andWDR respectively. Thefirmware caninterrogatethesebits
to determine the cause of a reset.
The microcontroller begins execution from ROM address
0x0000 after a POR or WDR reset. Although this looks like
interrupt vector 0, there is an important difference. Reset
processing does NOT push the program counter, carry flag,
and zero flag onto program stack. That means the reset
handler in firmware should initialize the hardware and begin
executingthe“main”loopof code.Attemptingto execute either
a RET or RETI in the reset handler will cause unpredictable
execution results.
Power-On Reset (POR)
Power-On Reset (POR) occurs every time the VCC voltage to
the device ramps from 0V to an internally defined trip voltage
(Vrst)of approximately1/2full supplyvoltage. Inadditiontothe
normal reset initialization noted under “Reset,” bit 4 (PORS) of
the Processor Status and Control Register is set to “1” to
indicate to the firmware that a Power-On Reset occurred. The
POR event forces the GPIO ports into input mode (high
impedance), and the state of Port 3 bit 7 is used to control how
the part will respond after the POR releases.
If Port 3 bit 7 is HIGH (pulled to VCC) and the USB IO are at
the idle state (DM HIGH and DP LOW) the part will go into a
semi-permanent power down/suspend mode, waiting for the
USB IO to go to one of Bus Reset, K (resume) or SE0. If Port
3 bit 7 is still HIGH when the part comes out of suspend, then
a128-µs timerstarts,delaying CPUoperationuntil theceramic
resonator has stabilized.
If Port 3 bit 7 was LOW (pulled to VSS) the part will start a 96-
ms timer, delaying CPU operation until VCC has stabilized,
then continuing to run as reset.
Firmware should clear the POR Status (PORS) bit in register
0xFF before going into suspend as this status bit selects the
128-µs or 96-ms start-up timer value as follows: IF Port 3 bit 7
is HIGH then 128-µs is always used; ELSE if PORS is HIGH
then 96-ms is used; ELSE 128-µs is used.
Watch Dog Reset (WDR)
The Watch Dog Timer Reset (WDR) occurs when the Most
Significant Bit (MSB) of the 2-bit Watch Dog Timer Register
transitions from LOW to HIGH. In addition to the normal reset
Figure 2. Clock Oscillator On-chip Circuit
XTALOUT
XTALIN
Clock Distribution
clk2x Clock
Doubler
clk1x
(to Microcontroller)
(to USB SIE)
30 pF
30 pF
At least 8.192 ms WDR goes high Execution begins at
Reset Vector 0X00
8.192 ms
2.048 ms
since last write to WDT for 2.048 ms
to 14.336 ms
Figure 3. Watch Dog Reset (WDR)
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