Motorola MVME712A/D3 User Manual download pdf (Page 62)

Test Descriptions

3-18 167Bug Debugging Package UserÕs Manual

Clock Function - CLK

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.

Command Input:

167-Diag>RTC CLK

Response/Messages:

After the command has been issued, the following line is printed:

RTC CLK: MK48T0x Real Time Clock............. Running --->

If all parts of the test are completed correctly, then the test passes.

RTC CLK: MK48T0x Real Time Clock............. Running ---> PASSED

If the test fails, then the display appears as follows.

RTC CLK: MK48T0x Real Time Clock............. Running ---> FAILED

(error message)

Here, (error message) is one of the following:

If the check for low battery fails.

RTC low battery

Note

The Low Battery test only assures Battery OK if the

MK48T02 (used on other boards) has not been written since

powerup. The Battery test is performed here in case the

debugger currently in use does not perform a Low Battery

test on powerup. Although the MK48T08 does not support

the internal battery voltage check (BOK), the BOK flag

status check algorithm is performed by this test on all parts.

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.

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Motorola MVME712A/D3 User Manual Page 62