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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.2 Configuration
Figure 9-1:
Block Diagram of the Clock Generator
This block diagram does not necessarily show the exact wiring in hardware but the functional structure.
64
(f
X
= 4 MHz)
50 (f
X
= 5 MHz)
1/2
f
CPU
1/128
f
X
f
XT
f
XXP
f
XX
1/2
SSCG
Main System
Clock OSC
Subsystem
Clock OSC
XT1
XT2
X1
X2
STOP
WATCH/S-WATCH
PLL Circuit
8
STOP
WATCH/S-WATCH
Prescaler
/8
f
XX
/6
f
XX
/4
f
XX
/3
f
XX
Selector
Selector
STOP
WATCH/S-WATCH
IDLE
WATCH/S-WATCH
HALT
CPU/BCU
Selector
Selector
f
PCLK
IDLE
WATCH
Peripherals
f
WDT
Watchdog Timer
Prescaler
Selector
f
XXT
Selector
f
XXT
f
CKSEL2
Watch Timer
/4
f
XXT
/32
f
CKSEL1
Watch Timer
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