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WATCH TIMER S3C84E5/C84E9/P84E9
14-2
WATCH TIMER CONTROL REGISTER (WTCON: R/W)
FAH WTCON.7 WTCON.6 WTCON.5 WTCON.4 WTCON.3 WTCON.2 WTCON.1 WTCON.0
RESET "0" "0" "0" "0" "0" "0" "0" "0"
Table 14-1. Watch Timer Control Register (WTCON): Set 1, Bank 0, FAH, R/W
Bit Name Values Function Address
WTCON.7 0 Select (fx/256) as the watch timer clock (fx: Main 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 (BZOUT) signal output
0 1 1 kHz buzzer (BZOUT) signal output
1 0 2 kHz buzzer (BZOUT) signal output
1 1 4 kHz buzzer (BZOUT) 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: Main system clock frequency (fx) is assumed to be 9.8304 MHz