NEC NEC PD78081(A), User Manual

Page: 93 / 274

70
CHAPTER 5 CLOCK GENERATOR
Figure 5-1. Block Diagram of Clock Generator
Main
System
Clock
Oscillator
X2
X1
STOP
PCC2 PCC1
Internal Bus
Standby
Control
Circuit
2
f
XX
2
2
f
XX 2
3
f
XX
2
4
f
XX
Prescaler
Clock to
Peripheral
Hardware
Prescaler
Oscillation Mode
Selection Register
f
XX
CPU Clock
(f
CPU
)
Scaler
Selector
f
X
2
f
X
MCS
Processor Clock Control Register
PCC0
3
Selector