IBM nec pd78081(a) User Manual
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CHAPTER 5 CLOCK GENERATOR
Figure 5-1. Block Diagram of Clock Generator
Main
System
Clock
Oscillator
System
Clock
Oscillator
X2
X1
STOP
PCC2 PCC1
Internal Bus
Standby
Control
Circuit
Control
Circuit
2
f
XX
2
2
f
XX
2
3
f
XX
2
4
f
XX
Prescaler
Clock to
Peripheral
Hardware
Peripheral
Hardware
Prescaler
Oscillation Mode
Selection Register
Selection Register
f
XX
CPU Clock
(f
(f
CPU
)
Scaler
Selector
f
X
2
f
X
MCS
Processor Clock Control Register
PCC0
3
Selector