S3C8245/P8245/C8249/P8249 WATCH TIMER

13-3

WATCH TIMER CIRCUIT DIAGRAM
WTCON.1
WTCON.2
WTCON.3
WTCON.4
WTCON.5
Enable/Disable Selector
Circuit
MUX
WTCON.0
WTINT
WTCON.6
BUZZER Output
f
W
/214
f
W
/213
f
W
/212
f
W
/26
f
W
/64 (0.5 kHz)
f
W
/32 (1 kHz)
f
W
/16 (2 kHz)
f
W
/8 (4 kHz)
1 Hz
f
xx
= Main System Clock (4.19 MHz)
f
xt
= Subsystem Clock (32.768 kHz)
fw = Watch timer
Clock
Selector
WTCON.7 Frequency
Dividing
Circuit
f
W
32.768 kHz
f
xt
f
xx
/128
f
LCD
(512 HZ)
f
VLD
(4096 HZ)
f
BOOSTER
(4096 HZ)
Figure 13-1. Watch Timer Circuit Diagram