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APPC 1220T/1221T/1520T/1521T/1720T/1721T User Manual

Appendix A: Watchdog Timer

aPPendix a: WatChdog timer

Start

See “SetupWDT” procedure

#Setup Watchdog Timer Environment

Step 1

Step 2

See “TimeBaseWDT” procedure

#Initial Watchdog Timer

Users can select second or minute

Step 3

See “TimeCountWDT” procedure

#Set Watchdog Timer Time-out Value

Users can set time-out value

Step 4

See ExitSetup procedure

#Exit Setup Environment

End

WDT Programming Guide

APPC Series Watchdog Function Configuration Sequence Description:

Watch Dog Sample Code

#define SUPERIO_PORT 0x2E

#define WDT_SET 0x72

#define WDT_VALUE 0x73

void main(void)

{

#Enter SuperIO Configuration

outportb(SUPERIO_PORT, 0x87);

outportb(SUPERIO_PORT, 0x01);

outportb(SUPERIO_PORT, 0x55);

# Set LDN

outportb(SUPERIO_PORT,0x07);

outportb(SUPERIO_PORT+1 ,0x07);

# Set WDT setting

outportb(WDT_SET,0xC0); # Use the second to come down

# If choose the Minute, change

value to 0x40

# Set WDT sec/min

outportb(WDT_VALUE,0x05); #Set 5 seconds

}

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