Preliminary
SNC749
16-bit Voice Processor
7. I/O PORT
SNC749 provides one a 24-bit I/O 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.
When user uses GPIO to wake up chip, the GPIO must setting to input mode and
Pull-High all I/O pin.
Pull-Up
Resister
Pull-Up
Select
In/Out
Control
PAD
Latch
to internal bus
In/Out
Control
I/O Configuration of P0.0~P0.15
Ver. 1.8
9
March 6, 2007
SONIX [ SONIX TECHNOLOGY COMPANY ]
