SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

5

7. I/O PORT

SNC735 provides one a 16-bit I/O port and an 8-bit input port for user application

(P0.0~P0.15, P1.0~P1.7). The input pull high resistor of each pin can be programmed by

Port Pull-High register. The direction of I/O port is selected by Port Direction register. The

Port0 (P0.0~P0.15) and Port1 (P1.0~P1.7) can wake the chip up from the stop mode and

watch mode. P0.15 can be modulated with a 38.5Khz carry signal to realize IR signal

transmission.

I/O Configuration of P0.0~P0.15

Input Port Configuration of Port 1 (P1.0~P1.7)

Pull-Up

Resister

Latch

PAD

to internal bus

Pull-Up

Select

In/Out

Control

In/Out

Control

Digital In

Pull-Up

Resister

PAD

Pull-Up

Select

Input Control