SNC21168A
1-CH H.Q. Speech Controller
PA
D
Port
Data
Port
Status
Wea
k
To Internal Data Bus
Read Control
I/O Port Configuration
Note:
(1) Weak N-MOS can serve as pull-low resistor.
(2) The driving/sink current of P3.3 & P3.2 is up to 8mA/16mA
5.8 IR Function
Bit 3 of Mode Register is applied to control the IR function. P33 can be modulated with
38.5KHz square wave before sent out to P3.3 or P2.3 pin. P3.3 and P2.3 out is
controlled by Mode1.1. If Mode1.1 set 1 IR is use P2.3, set “0” is use P3.3. The IR
signal can be achieved by this modulated signal.
5.9 PWM IO control
SNC21168A has support 6 PWM IO (P3.0~P3.3 & P6.0~P6.1). Each I/O has 8 bit
independent duty register, and the 8 bit register are compare with 8 bits counter. If set
use PWM IO function and internal counter start at 000H, the mapping I/O will set High.
The 8 bits counter increment if the same duty-register, that will reset the mapping IO
pin.
5.10 Watch Dog Timer
SNC21168A built-in an internal WDT (Watch Dog Timer). This Watchdog timer would
issue resets signal to this chip if it is not cleared before reaching terminal count (1 sec).
The watchdog timer is enabled at reset and cannot be disabled.
6
Ver1.1
April 28, 2009
SONIX [ SONIX TECHNOLOGY COMPANY ]
