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9 ClOCK TiMeR
9.6
Precautions
• Be sure to read timer data in the order of low-order data (TM[3:0]) then high-order data (TM[7:4]).
• The clock timer count clock does not synch with the CPU clock. Therefore, the correct value may not be obtained
depending on the count data read and count-up timings. To avoid this problem, the clock timer count data should
be read by one of the procedures shown below.
- Read the count data twice and verify if there is any difference between them.
- Temporarily stop the clock timer when the counter data is read to obtain proper data.
• When resetting the clock timer (TMRST = "1"), do not start the clock timer (TMRUN = "1") simultaneously. If
both control bits are set to "1," the clock timer may not reset properly.
9-4
Seiko epson Corporation
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
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