![NEC U789436 Series User Manual Download Page 103](http://html.mh-extra.com/html/nec/u789436-series/u789436-series_user-manual_249277103.webp)
CHAPTER 5 CLOCK GENERATOR
User’s Manual U15075EJ2V1UD
103
Figure 5-1. Block Diagram of Clock Generator
f
XT
f
X
or
f
CC
or
Prescaler
f
X
2
2
f
CC
2
2
f
XT
2
1/2
Prescaler
16-bit timer 90
8-bit timer 60
Watch timer
LCD controller/driver
Clock to
peripheral
hardware
CPU clock
(f
CPU
)
Standby
controller
Wait
controller
Selector
STOP
MCC PCC1
CLS CSS0
Internal bus
Suboscillation mode register
(SCKM)
FRC SCC
Internal bus
Subclock control
register (CSS)
Processor clock
control register
(PCC)
Subsystem
clock
oscillator
X1 or CL1
X2 or CL2
XT1
XT2
Main system
clock
oscillator