Samsung S3F401F - Manual (Page 45)

S3F401F_UM_REV1.00 BASIC TIMER & WDT
3-5
2.4 WATCH DOG TIMER DURATION
The Watch-Dog Timer Counter, WTCNT, can be used to specify the time-out duration and is a free-running 3-bit
counter. To enable Watch-Dog Timer, you should write the data in BTCON[15:8] register except 0xA5. In case of
0xA5, it will disable the Watch-Dog Timer. After writing certain value in BTCON[15:8] except 0xA5, there will be a
system reset if the overflow occurs.
Clock Source Resolution Watch-Dog Timer Interval Time
Fin = 4MHz Fin / 2^5* 2^8 2.048 ms 2^5 * 2^8 * 2^3 / Fin =16.384 ms
Fin = 4MHz Fin / 2^6* 2^8 4.098 ms 2^6 * 2^8 * 2^3 / Fin = 32.784 ms
Fin = 4MHz Fin / 2^10 * 2^8 65.536 ms 2^10 * 2^8 * 2^3 / Fin = 524.288 ms
Fin = 4MHz Fin / 2^12 * 2^8 262.144 ms 2^12 * 2^8 *2^3 / Fin = 2.097 s
Clock Source Resolution Watch-Dog Timer Interval Time
Fin = 6MHz Fin / 2^5* 2^8 1.364 ms 2^5 * 2^8 * 2^3 / Fin = 10.912 ms
Fin = 6MHz Fin / 2^6* 2^8 2.728 ms 2^6 * 2^8 * 2^3 / Fin = 21.824 ms
Fin = 6MHz Fin / 2^10 * 2^8 42.664 ms 2^10 * 2^8 * 2^3 / Fin = 341.312 ms
Fin = 6MHz Fin / 2^12 * 2^8 174.760 ms 2^12 * 2^8 *2^3 / Fin = 1.398 s
Clock Source Resolution Watch-Dog Timer Interval Time
Fin = 8MHz Fin / 2^5* 2^8 1.024 ms 2^5 * 2^8 * 2^3 / Fin = 8.192 ms
Fin = 8MHz Fin / 2^6* 2^8 2.048 ms 2^6 * 2^8 * 2^3 / Fin = 16.384 ms
Fin = 8MHz Fin / 2^10* 2^8 32.768 ms 2^10 * 2^8 * 2^3 / Fin = 262.144 ms
Fin = 8MHz Fin / 2^12 * 2^8 131.072 ms 2^12 * 2^8 *2^3 / Fin = 1.048 s