SN8P1602A datasheet(61/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 61

Version 1.1

I/O PORT FUNCTION TABLE

SN8P1602B

Port/Pin

I/O

Function Description

Remark

General-purpose input function

External interrupt (INT0)

See <P00G1,P00G0>

P0.0

Wakeup from power down mode

See <P00G1,P00G0>

General-purpose input/output function

P1.0~P1.4

I/O

Wakeup from power down mode

Level Change

P2.0~P2.7

I/O

General-purpose input/output function

Note: The P1.4 enables when the external oscillator is RC type.

I/O PORT MODE

The port direction is programmed by PnM register. Port 0 is always input mode. Port 1 and Port 2 can select input or

output direction.

SN8P1602B

0C1H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P1M

P14M

P13M

P12M

P11M

P10M

Read/Write

R/W

After reset

SN8P1602B

0C2H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P2M

P27M

P26M

P25M

P24M

P23M

P22M

P21M

P20M

Read/Write

R/W

After reset

When PnM=0, the Pn is input mode

PnM=1, the Pn is output mode

Users can program them by bit control instructions (B0BSET, B0BCLR).

Example: I/O mode selecting

CLR

P1M

; Set all ports to be input mode.

CLR

P2M

MOV

A, #0FFH

; Set all ports to be output mode.

B0MOV

P1M, A

B0MOV

P2M, A

B0BCLR

P1M.2

; Set P1.2 to be input mode.

B0BSET

P1M.2

; Set P1.2 to be output mode.

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