SNC745
16-bit Voice Processor
7. I/O PORT
SNC745 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.
Pull-Up
Resister
In/Out
Control
Pull-Up
Select
PAD
Latch
to internal bus
In/Out
Control
I/O Configuration of P0.0~P0.15
Pull-Up
Resister
PAD
Input Port Configuration of Port 1 (P1.0~P1.7)
5
Ver. 1.3
October 23, 2002
SONIX [ SONIX TECHNOLOGY COMPANY ]
