Technical data

3-114 Computer Group Literature Center Web Site
Test Descriptions
3
CLK - Real Time Clock Function
Command Input
PPCx-Diag>RTC CLK
Description
This test verifies the functionality of the Real Time Clock (RTC). This test
does not check clock accuracy.
This test requires approximately nine seconds to run. At the conclusion of
the test, nine seconds are added to the clock time to compensate for the test
delay. Because the clock can only be set to the nearest second, this test may
induce one second of error into the clock time.
Response/Messages
After the command has been issued, the following line is printed:
RTC CLK: MK48Txx Real Time Clock............ Running --->
If all parts of the test are completed correctly, then the test passes:
RTC CLK: MK48Txx Real Time Clock............ Running ---> PASSED
If the test fails, then the display appears as follows:
RTC CLK: MK48Txx Real Time Clock............ Running ---> FAILED
RTC/CLK Test Failure Data:
(error message)
Here (error message) is one of the following:
If the check for low battery fails:
RTC low battery
The RTC time registers are configured for constant updating by the clock
internal counters. The seconds register is read initially and then monitored
(read) to verify that the seconds value changes. A predetermined number
of reads are made of the seconds register.