User’s Manual U13045EJ2V0UM00
87
CHAPTER 6 CLOCK GENERATOR (
µ
PD789104, 789114 SUBSERIES)
6.1 Function of Clock Generator
The clock generator generates the clock to be supplied to the CPU and peripheral hardware.
The system clock oscillator is the following type.
• System clock (crystal/ceramic) oscillator
This circuit oscillates at frequencies of 1.0 to 5.0 MHz. Oscillation can be stopped by executing the STOP
instruction.
6.2 Configuration of Clock Generator
The clock generator consists of the following hardware.
Table 6-1. Configuration of Clock Generator
Item
Configuration
Control register
Processor clock control register (PCC)
Oscillator
Crystal/ceramic oscillator
Figure 6-1. Block Diagram of Clock Generator
f
X
Prescaler
System clock
oscillator
2
2
f
X
Selector
PCC1
Internal bus
Processor clock control register (PCC)
Prescaler
Standby
control
circuit
Wait control
circuit
CPU clock (f
CPU
)
Clock to peripheral
hardware
STOP
X1
X2
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