Technical data

RTC - MK48Txx Timekeeping Tests
http://www.motorola.com/computer/literature 3-117
3
WATCHDOG - Watchdog Time-Out Reset
Command Input
PPCx-Diag>rtc watchdog
Description
This test sets the Real Time Clock’s Watchdog Timer to time out in one
second. If the Watchdog Timer is functional, the WDF (Watchdog Flag)
bit will be set and a microprocessor reset will be generated.
!
Caution
If this test passes, the Real Time Clock will reset the board.
Response/Messages
After the command has been issued, the following line is printed:
RTC WATCHDOG: MK48Txx Battery Backed Up RAM.. Running --->
If all parts of the test are completed correctly, then the test passes by
resetting the board.
If the test fails, then the display appears as follows:
RTC WATCHDOG: MK48Txx Battery Backed Up RAM.. Running ---> FAILED
RTC/WATCHDOG Test Failure Data:
(error message)
Here (error message) is the following:
If the Watchdog Timer failed to reset the microprocessor when a time-out
condition occurred,
(error message) is:
Processor reset failed to occur.
If the WDT bit failed to be set when a time-out condition occurred, (error
message) is:
WDF (Watchdog Flag) bit was not set.