Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 137)

RPBASIC-52 PROGRAMMING GUIDE

2-118

WDOG

Syntax: WDOG [time]

Where: time = 0, 1, or 2

no parameter = toggle watchdog timer

0 = turn off watch dog timer

1 = set timeout interval to 0.38 seconds

2 = set timeout interval to 2.8 seconds

Function: Resets or sets watchdog tim er.

Mode: Run

Use: WDOG

Cards: All. Cards use this command in different ways. Refer to your hardware manual to verify operation.

DESCRIPTION

The w atchdog tim er is a supervisory function fo r applications that ca nnot a fford to "crash" .

WDOG 1 or WDO G 2 enables the watchdog and sets the interval. WDOG is executed periodically by your

program to prevent the card from resetting. WD OG 0 turn s off the watchd og timer.

Different cards m ay use different time out periods. Refer to your hardw are manu al.

none

ERROR

BAD ARGUM ENT when time is out of range

EXAMPLE

The followin g exam ple sho ws how ONTICK can be used to reset th e tim er. The watchdog timer is set for 2.8

seconds.

10 WDOG 2

20 CLEAR TICK(0)

30 ONTICK 2,200

40 GOTO 40

200 PRINT TICK(0)

210 WDOG

220 RETI

When a watchdog timeout occurs, only the CP U is reset. The effect is the same as performing a hardware

reset, except a hardware reset pulse is not issued. Digital I/O at J3 does not change. Digital lines L0 - L8 are

reset to power up conditions as is the display port.

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Remote-processing BASIC 52 Uživatelský manuál Strana 137