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SNC21340

更新时间： 2022-04-23 23:00:11

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SNC21340 数据手册

SNC21340

1-CH H.Q. Speech Controller

5.6

I/O Ports

There are four 4-bit I/O ports P1, P2, P3 and P6. Any I/O can be individually

programmed as either input pull low or output. Any valid data transition (HꢂL or

LꢂH) of P1, P2, P3 and P6 can reactivate the chip when it is in power-down stage.

Port Data

PAD

Port Status

Weak

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

5.7

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.

5.8

PWM IO control

SNC21340 have support 4 PWM IO (P30~P33). Each I/O has 8 bits independent duty

5.9

Watch Dog Timer

SNC21340 built 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 (1sec).

The watchdog timer is enabled at reset and cannot be disabled.

Ver: 1.0

November 08, 2006

1...3 4 567 8 9...11

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