SN8P1602AS datasheet(71/94 Pages) SONIX

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SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 71

Revision 1.94

0I/O PORT

OVERVIEW

The SN8P1602/1603 provides up to 3 ports for users’ application, consisting of one input only port (P0), two I/O ports

(P1, P2,). The SN8P1602/1603 is without input pull-up resistors. The direction of I/O port is selected by PnM register.

After the system resets, these ports work as input function.

The SN8P1604 provides 4 ports for users’ application, consisting of one input port (P0) and three I/O ports (P1,P2,P5).

The direction of I/O port is selected by PnM register. After the system resets, these ports work as input port without pull

up resistors. If the user want to read-in a signal from I/O pin, it recommends to switch I/O pin as input mode to execute

read-in instruction. (B0BTS0 M.b, B0BTS1 M.b or B0MOV A,M). The pull-up resistor can be set up by the code option

in the programming phase.

SN8P1602/1603

Port0 structure

Int. bus

PnM

Latch

Port1, 2 structure

PnM

Port0 structure

Int. bus

PnM

Latch

Port1, 2 structure

PnM

Note: All of the latch output circuits are push-pull structures.

SN8P1604

Port0 structure

PUR

Code Option

Int. bus

PUR

PnM, Code Option

Int. bus

PnM

Latch

Port1,2, 5 structure

PnM

Port0 structure

PUR

Code Option

Int. bus

PUR

PnM, Code Option

Int. bus

PnM

Latch

Port1,2, 5 structure

PnM

Note: The pull-up resistor can be set up by the code option in the programming phase.

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