AD009-041

Page 10 of 14

Version 1.0

Common I/O

Symbol

Addr

R/W

RSTB D3

D2

D1

D0

Description

IOC_PA

02H

R/W

0000

USER0

IOCA2

IOCA1

IOCA0

Port A input/output direction select

1: set port A as output port individual pin

0: set port A as input port individual pin

USER0: 1 bit user RAM

DATA_PA

03H

R/W

xxxx

DPA3

(Read

only )

DPA2

DPA1

DPA0

Read data from PA0~PA3 PIN and write

data to PA0~PA2 PIN ( I/O direction is

selected by IOC_PA register)

IOC_PB

05H

R/W

0000

IOCB3

IOCB2

IOCB1

IOCB0

Port B input/output direction select

1: set port B as output port individual pin

0: set port B as input port individual pin

DATA_PB

06H

R/W

xxxx

DPB3

DPB2

DPB1

DPB0

Read port B data from PB0~PB3 port and

write to PB0~PB3 ( I/O direction is

defined by IOC_PB register)

Extended I/O

Symbol

Addr

R/W

Reset

D3

D2

D1

D0

Description

PAPU

00H

W

0000

PAPU.3

PAPU.2

PAPU.1

PAPU.0

Port A pull up 150K ohm resistor

0: Port A pull up resistor disabled

1: Port A pull up resistor enabled

PBPU

02H

W

0000

PBPU.3

PBPU.2

PBPU.1

PBPU.0

Port B pull up 150K ohm resistor

0: Port B pull up resistor disabled

1: Port B pull up resistor enabled

PAWK

06H

W

0000

PAWK.3 PAWK.2 PAWK.1 PAWK.0 Port A wake up enable control

0: Port A wake up disabled

1: Port A wake up enabled

PBWK

07H

W

0000

PBWK.3 PBWK.2 PBWK.1 PBWK.0 Port B wake up enable control

0: Port B wake up disabled

1: Port B wake up enabled

The Port A and Port B are 4-bit I/O port except PA3 is an input port. They can be bit programmable setting

as input port or output port. In output mode, the data can be written out to external pin by DATA_PA OR

DATA_PB register, and reading this output port will get data from DATA_PA or DATA_PB register. Pull-up

resistor (150K ohm) will be disabled when output mode is selected.

In input mode, Port A and Port B data can be read from external pin by reading DATA_PA or DATA_PB

register, and they are provided pull-up resistor 150K or not by PAPU, PBPU registers.

In addition, each pin of Port A and Port B also can be with wake up function by using register PAWK or

PBWK setting to 1. In HALT mode, If Port A or Port B with wake up enabled by these registers, any edge

trigger (rising or falling) occurred on Port A or Port B will wake up system and turn on HRCOSC oscillator,

and the program counter of MCU will jump to the address 04H, running the wake up sub-routing program.

PA3 is an input pin only, provided with pull up 150K ohm and edge wake up function.

5. 9. 2 Por t C (o utp u t)

REM PIN is an open drain output port with large sink current structure, REM pin is controlled by DPC1

register.

Symbol

Addr

R/W

Reset

D3

D2

D1

D0

Description

IR_DIV

01H

R/W

1000

DPC1

(REM)

X

X

X

DPC1(PC1/REM) is an output port for

IR LED driving.

5. 9. 3 Por t D ( i nput / output)

Symbol

Addr

R/W

Reset

D3

D2

D1

D0

Description

IOC_PD

0CH

R/W

0000

X

IOCD2

IOCD1

IOCD0

Port D input/output direction select

1: set port D as output port individual pin

0: set port D as input port individual pin