User's Manual

REAL TIME CLOCK S3C2450X RISC MICROPROCESSOR
14-4
1.2.5 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
- n: RTC clock divide value(decided by RTCCON[8:4] )
• Resolution = 1 / Tick clock frequency
• Clock range = Resolution * 2
32
Tick counter clock source
selection
Tick clock
source frequency(Hz)
Clock range (s) Resolution (ms)
TICSel = 1 32768 (2^15)
0 ~ 2
17
0.03
TICsel2 = 0, TICSel =0 16384 (2^14)
0 ~ 2
18
0.06
TICsel2 = 1, TICSel =0 8192 (2^13)
0 ~ 2
19
0.12
TICsel2 = 2, TICSel =0 4096 (2^12)
0 ~2
20
0.24
TICsel2 = 3, TICSel =0 2048 (2^11)
0 ~ 2
21
0.49
TICsel2 = 6, TICSel =0 1024 (2^10)
0 ~ 2
22
0.97
TICsel2 = 7, TICSel =0 512 (2^9)
0 ~ 2
23
1.95
TICsel2 = 8, TICSel =0 256 (2^8)
0 ~ 2
24
3.90
TICsel2 = 4, TICSel =0 128 (2^7)
0 ~ 2
25
7.81
TICsel2 = 9, TICSel =0 64 (2^6)
0 ~ 2
26
15.62
TICsel2 = 10, TICSel =0 32 (2^5)
0 ~ 2
27
31.25
TICsel2 = 11, TICSel =0 16 (2^4)
0 ~ 2
28
62.50
TICsel2 = 12, TICSel =0 8 (2^3)
0 ~ 2
29
125
TICsel2 = 13, TICSel =0 4 (2^2)
0 ~ 2
30
250
TICsel2 = 14, TICSel =0 2
0 ~2
31
500
TICsel2 = 5, TICSel =0 1
0 ~2
32
1000
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.