Samsung KS57C2308 Manual page 173

KS57C2308/P2308/C2316/P2316
Main-System
Oscillator
Circuit
X IN
Oscillator
SCMOD.3
SCMOD.0
SCMOD.2
PCON.0
PCON.1
IDLE
PCON.2
STO
PCON.3
fx: Main-system clock
fxt: Sub-system clock
fxx: System clock
fx
X OUT
Stop
PCON.3, .2 clear
Figure 6-1. Clock Circuit Diagram
fxt
Selector
Oscillator
Stop
fxx
1/8 - 1/4096
Frequency
Dividing
Circuit
1/2 1/16
Selector
fx/1,2,16
Selector
Oscillator
Control
Circuit
OSCILLATOR CIRCUITS
Sub-System
Oscillator
Circuit
XT IN
Basic Timer
Timer/Counter
Watch Timer
LCD Controller
Clock Output Circuit
SIO
fxt
1/4
CPU stop signal
(By IDLE or STOP instruction)
Wait release signal
Internal RESET
Power down release
Watch Timer
LCD Controller
XT OUT
CPU clock
signal
6-3