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S3C8248/C8245/P8245/C8247/C8249/P8249
WATCH TIMER CIRCUIT DIAGRAM
WTCON.5
WTCON.4
WTCON.3
WTCON.2
WTCON.1
WTCON.7
Enable/Disable
f
W
Clock
Selector
32.768 kHz
f
fxx/128
XT
fxx = Main System Clock (4.19 MHz)
f
= Subsystem Clock (32768 Hz)
XT
fw = Watch timer
Figure 13-1. Watch Timer Circuit Diagram
WTCON.6
MUX
f
/64 (0.5 kHz)
W
f
/32 (1 kHz)
W
f
/16 (2 kHz)
W
f
/8 (4 kHz)
W
Selector
Circuit
6
f
/2
W
12
f
/2
W
Frequency
13
f
/2
W
Dividing
f
/2
W
Circuit
BUZZER Output
WTINT
WTCON.0
14
f
(4096 HZ)
VLD
1 Hz
f
(4096 HZ)
BOOSTER
f
(512 HZ)
LCD
WATCH TIMER
13-3
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