S3C9228/P9228

WATCH TIMER

 

 

WATCH TIMER CIRCUIT DIAGRAM

WTCON.7

 

 

 

 

 

WTCON.6

WT INT Enable

 

 

BUZ (P0.3)

WTCON.5

 

 

 

WTCON.6

 

 

 

 

 

WTCON.4

 

 

MUX

 

WTINT

 

 

 

 

8

 

 

 

fW/64 (0.5 kHz)

 

WTCON.3

 

 

 

fW/32 (1 kHz)

 

 

 

 

 

fW/16 (2 kHz)

 

WTCON.2

 

 

 

fW/8 (4 kHz)

 

Enable/Disable

 

 

Selector

 

WTCON.1

 

 

 

INTPND2.3

 

 

 

 

Circuit

WTCON.0

 

 

 

 

 

 

 

 

 

 

 

 

 

fW/27

 

 

 

Frequency

fW/213

 

Clock

fW/214

 

fW

Dividing

 

Selector

 

fW/215

(1 Hz)

32.768 kHz

Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

fLCD = 2048 Hz

fxt

fx/128

fX = Main clock (where fx = 4.19 MHz)

 

 

 

 

fxt

= Sub clock (32,768 Hz)

 

 

 

fW = Watch timer frequency

 

Figure 12-2. Watch Timer Circuit Diagram

12-3

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Image 413
Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Watch Timer Circuit Diagram