TMPM330 - Keil

(2) Writing clock data
Under development
TMPM330 (rev0.4) 15-11
TMPM330
A carry during writing ruins correct data writing. The following procedure ensures the
correct data writing.
1. Using 1Hz interrupt
The count-up of the internal data synchronizes with 1Hz interrupt. Data can be written
correctly if writing data after 1Hz interrupt occurred.
2. Resetting counter
The RTC incorporates 15-stage counter that generates a 1Hz clock from 32,768 KHz.
After resetting the counter, the data is written.
If clearing the counter, an interrupt is output only first writing at half of the setting time.
To ensure the correct clock counting, enable the 1Hz-interrupt after clearing the counter.
And then set the time after the first interrupt (occurs at 0.5Hz) occurs.
Start
PAGER=“0” then
select PAGE0
RESTR=“1” then
reset counter
RESTR=“0” then
enable 1Hz interrupt
First interrupt (After 0.5S)
YES
Time setting
End
Fig. 15-3 Flowchart of the clock data writing
NO
Real Time Clock