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S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
WATCH TIMER CIRCUIT DIASGRAM
WTCON.7
WTCON.6
WTCON.5
WTCON.4
8
WTCON.3
WTCON.2
WTCON.1
WTCON.0
(Pending Bit)
WT INT Enable
Enable/Disable
Clock
f
W
Selector
32.768 kHz
fxt
fx/128
Figure 12-2. 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
7
f
/2
W
13
f
/2
W
Frequency
14
f
/2
W
Dividing
f
W
Circuit
f
= Main clock (where fx = 4.19 MHz)
X
fxt = Sub clock (32.768 kHz)
f
= Watch timer frequency
W
WATCH TIMER
BUZ (P0.7)
WTINT
WTCON.0
15
/2
(1 Hz)
f
= 2048 Hz
LCD
12-3
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