Samsung S3C2451X User Manual page 336

Real Time Clock
14.3.5 Tick time interrupt
The RTC tick time is used for interrupt request. The TICNT register has an interrupt enable bit and the count
value for the interrupt. The count value reaches '0' when the tick time interrupt occurs. Then the period of
interrupt is as follows:
Tick clock frequency (Hz) = RTC clock / 2
-
n: RTC clock divide value(decided by RTCCON[8:4] )
Resolution = 1 / Tick clock frequency
-
- Clock range = Resolution * 2
Tick counter clock
source selection
TICSel = 1
TICsel2 = 0, TICSel =0
TICsel2 = 1, TICSel =0
TICsel2 = 2, TICSel =0
TICsel2 = 3, TICSel =0
TICsel2 = 6, TICSel =0
TICsel2 = 7, TICSel =0
TICsel2 = 8, TICSel =0
TICsel2 = 4, TICSel =0
TICsel2 = 9, TICSel =0
TICsel2 = 10, TICSel =0
TICsel2 = 11, TICSel =0
TICsel2 = 12, TICSel =0
TICsel2 = 13, TICSel =0
TICsel2 = 14, TICSel =0
TICsel2 = 5, TICSel =0
Note:
This RTC time tick may be used for real time operating system (RTOS) kernel time tick.
If time tick is generated by the RTC time tick, the time related function of RTOS will always synchronized in real
time.
14-4
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
n
32
Tick clock
source
frequency(Hz)
32768 (2^15)
16384 (2^14)
8192 (2^13)
4096 (2^12)
2048 (2^11)
1024 (2^10)
512 (2^9)
256 (2^8)
128 (2^7)
64 (2^6)
32 (2^5)
16 (2^4)
8 (2^3)
4 (2^2)
2
1
S3C2451
Clock range (s)
17
0 ~ 2
18
0 ~ 2
19
0 ~ 2
20
0 ~2
21
0 ~ 2
22
0 ~ 2
23
0 ~ 2
24
0 ~ 2
25
0 ~ 2
26
0 ~ 2
27
0 ~ 2
28
0 ~ 2
29
0 ~ 2
30
0 ~ 2
31
0 ~2
32
0 ~2
RISC MICROPROCESSOR
Resolution (ms)
0.03
0.06
0.12
0.24
0.49
0.97
1.95
3.90
7.81
15.62
31.25
62.50
125
250
500
1000