TMPM330 - Keil

15.5 Operational description
(1) Reading clock data
1. Using 1Hz interrupt
Under development
TMPM330 (rev0.4) 15-10
TMPM330
The count-up of the internal data synchronizes with 1Hz interrupt. Data can be read
correctly if reading data after 1Hz interrupt occurred.
2. Using pair reading
There is a possibility that the clock data may be read incorrectly if the internal counter
operates carry during reading. To ensure correct data reading, read the clock data twice
as shown below. A pair of data read successively needs to match.
Start
PAGER = “0”, then
select PAGE0
Clock data reading
(1st)
Clock data reading
(2nd)
1 st data = 2 nd data
End
YES
NO
Fig. 15-2 Flowchart of the clock data reading
Real Time Clock