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