Samsung S5PC110, Manual

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S5PC110_UM 4 REAL TIME CLOCK (RTC)
4-5
4.6 TICK TIME INTERRUPT
The RTC tick time is used for interrupt request. The TICNT register contains an interrupt enable bit and count
value for the interrupt. If the count value reaches ‘0’ if the tick time interrupt occurs. Then the period of interrupt is
as follows:
• Period = (n+1) / (Tick clock source frequency) second (n= tick counter value)
Table 4-1 Tick Interrupt Resolution
Tick Counter Clock
Source Selection
Tick Clock
Source Frequency(Hz)
Clock Range (s) Resolution (ms)
4’b0000 32768 (2^15) 0 ~ 131071 0.03
4’b0001 16384 (2^14) 0 ~ 262143 0.06
4’b0010 8192 (2^13) 0 ~ 524287 0.12
4’b0011 4096 (2^12) 0 ~ 1048575 0.24
4’b0100 2048 (2^11) 0 ~ 2097151 0.49
4’b0101 1024 (2^10) 0 ~ 4194303 0.97
4’b0110 512 (2^9) 0 ~ 8388607 1.95
4’b0111 256 (2^8) 0 ~ 16777215 3.90
4’b1000 128 (2^7) 0 ~ 33554431 7.81
4’b1001 64 (2^6) 0 ~ 67108863 15.62
4’b1010 32 (2^5) 0 ~ 134217727 31.25
4’b1011 16 (2^4) 0 ~ 268435455 62.50
4’b1100 8 (2^3) 0 ~ 536870911 125
4’b1101 4 (2^2) 0 ~ 1073741823 250
4’b1110 2 0 ~ 2147483647 500
4’b1111 1 0 ~ 4294967295 1000
NOTE:
You can select the appropriate tick time clock source to extend the tick time resolution.
This RTC time tick can be used for Real Time Operating System (RTOS) kernel time tick. If RTC time tick
generates time tick, the time related function of RTOS always synchronized in real time.