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WATCHDOG TIMER CHAPTER 11

Page 30

Figure 11-1 W5 Watchdog jumper

DESCRIPTION

The watchdog timer is used to reset the RPC-52 if the

program or CPU "cr ashes" . W hen jump er W 5 is

installed, the WDOG command must be executed at least

once ever y 1.2 seconds to avoid a reset. The timeout is

not adjustable.

The watchdog should not be used if using a RPBASIC-52

INPUT statement. Also, loops which do not end quickly

or are of indeterminate dur ation should be avoided unless

a timer reset pulse is included. An example of an

indeterminate loop is one that waits for a port condition

to change.

The watchdog is enabled by jumpering W 5. T he timer is

reset by executing a WDOG command.

The watchdog timer is part of a voltage monitor, battery

backup controller, and reset chip U16.

PROGRAM EXAMPLE

The follow ing progr am fragment resets the tim er while

the program is running.

5000 WDOG

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Remote-processing RPC-52 Manual de usuario Pagina 32