tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 499

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

Real Time Clock (RTC)
19.4.2 Alarm function
outputs a 1-shot pulse by detecting the falling edge.
clock or alarm function is used.
(1) INTRTC interrupt is generated when the alarm register corresponds with the clock
(2) 1Hz ,2Hz,4Hz,8Hz, 16Hz clock
(1) How to use alarm
By writing “1” to PAGER<PAGE>, the alarm function of the PAGE1 registers is enabled. The INTRTC
The RTC is not initialized by reset. Clear the interrupt request flag in the interrupt controller when the
this case, the alarm always corresponds with the value of the clock. The INTRTC interrupt request is
generated if PAGER <INENA> <ENAALM>=”1”.
Each writing releases the “don’t care” state respectively.
RTC generates an INTRTC interrupt. However, contents which have not been set up (“don't care”
state) are always considered to be corresponding.
“don’t care” state by initializing the alarm.
(PM12:00) every day.
kHz (about 30us) for the time register setting to become valid. In the above example, it is necessary to
set 31μs of set up time between setting the time register and enabling the alarm register.
(Note) This set up time is unnecessary when you use only internal interruption.
To initialize the alarm, write “1” to RESTR<RSTALM>. It makes all alarm settings “don’t care”. In
Setting alarm for min., hour, date and day is done by writing data to the relevant PAGE1 register.
When all setting contents correspond with the setting of PAGER<INTENA> <ENAALM>=1”, the
Contents which have already been set up cannot be returned independently but all together to the
The following is an example program for outputting an alarm from the ALARM pin at noon
When the CPU is operating at high frequency oscillation, it may take a maximum of one clock at 32
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
(DAYR), FFH
(DATAR),FFH
(HOURR), FFH
(MINR), FFH
(HOURR), 12H
(MINR), 00H
(PAGER), 0CH
(PAGER), 09H
(RESTR), D7H
(PAGER), 8CH
TMP19A44 (rev1.3) 19-13
;
;
;
;
;
;
;
;
;
Disables alarm, sets PAGE1
Initializes alarm
Sets 12 o’clock
Sets 00 min.
Set up time 31 μs (Note)
Enables alarm
Enables interrupt
TMP19A44
2010-04-01