tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 497

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Real Time Clock (RTC)
(2) Writing clock data
1. Using 1Hz interrupt
2. Resetting counter
writing.
A carry during writing ruins correct data writing. The following procedure ensures the correct data
correctly if writing data after 1Hz interrupt occurred.
resetting the counter, the data is written.
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.
The count-up of the internal data synchronizes with 1Hz interrupt. Data can be written
The RTC incorporates 15-stage counter that generates a 1Hz clock from 32,768 KHz. After
If clearing the counter, an interrupt is output only first writing at half of the setting time. To
Fig. 19.3 Flowchart of the clock data writing
TMP19A44 (rev1.3) 19-11
RESTR<RSTTMR>=“1” then
RESTR<DIS1HZ>=“0” then
PAGER<PAGE>=“0” then
First interrupt (After 0.5S)
enable 1Hz interrupt
select PAGE0
reset counter
Time setting
Start
End
YES
NO
TMP19A44
2010-04-01