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WATCH TIMER S3C8245/P8245/C8249/P8249
13-2
WATCH TIMER CONTROL REGISTER (WTCON: R/W)
FBH WTCON.7 WTCON.6 WTCON.5 WTCON.4 WTCON.3 WTCON.2 WTCON.1 WTCON.0
nRESET "0" "0" "0" "0" "0" "0" "0" "0"
Table 13-1. Watch Timer Control Register (WTCON): Set 1, Bank 1, FAH, R/W
Bit Name Values Function Address
WTCON.7 0 Select (fxx/128) as the watch timer clock FAH
1 Select subsystem clock as watch timer clock
WTCON.6 0 Disable watch timer interrupt
1 Enable watch timer interrupt
WTCON.5–.4 0 0 0.5 kHz buzzer (BUZ) signal output
0 1 1 kHz buzzer (BUZ) signal output
1 0 2 kHz buzzer (BUZ) signal output
1 1 4 kHz buzzer (BUZ) signal output
WTCON.3–.2 0 0 Set watch timer interrupt to 0.5 s.
0 1 Set watch timer interrupt to 0.25 s.
1 0 Set watch timer interrupt to 0.125 s.
1 1 Set watch timer interrupt to 1.955 ms.
WTCON.1 0 Disable watch timer, clear frequency dividing circuits
1 Enable watch timer
WTCON.0 0 Interrupt is not pending, clear pending bit when write
1 Interrupt is pending
NOTE: Watch timer clock frequency (fw) is assumed to be 32.768 kHz.