MON166: Watchdog Refresh when using Monitor

Information in this article applies to:

• C166 All Versions

QUESTION

I like to store the Monitor-166 in an external Flash ROM. Both the Monitor and the user application is stored in this Flash ROM. I added a small software routine that allows (after processor reset) the selection application or Monitor. Unfortunately, the boot software enables the watchdog, but I know that the Monitor only works with the watchdog disabled.

Is it possible to add watchdog refresh instructions to the Monitor?

ANSWER

Yes, you may add watchdog refresh instructions to the file INST167.A66 in the functions INSTAT and OUTSTAT as shown below:

INSTAT:    BMOV   R4.0,S0RIR  ; INPUT STATUS OF SERIAL INTERFACE
           SRVWDT
           RET

OUTSTAT:   BMOV    R4.0,S0TIR ; OUTPUT STATUS OF SERIAL INTERFACE
           SRVWDT
           RET

This ensures that the watchdog gets refreshed during Monitor communication.

MORE INFORMATION

• Refer to the MON166 User's Guide.
• Refer to the Getting Started User's Guide.

Last Reviewed: Thursday, February 25, 2021