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User’s Manual U12978EJ3V0UD

CHAPTER 5 CLOCK GENERATOR

5.1 Clock Generator Functions

The clock generator generates the clock to be supplied to the CPU and peripheral hardware. The following type

of system clock oscillator is used.

•

••

• System clock oscillator

This circuit oscillates at 6.0 MHz. Oscillation can be stopped by executing the STOP instruction.

5.2 Clock Generator Configuration

The clock generator consists of the following hardware.

Table 5-1. Configuration of Clock Generator

Item Configuration

Control register Processor clock control register (PCC)

Oscillator System clock oscillator

Figure 5-1. Block Diagram of Clock Generator

Prescaler

System

clock oscillator

Prescaler

Standby

controller

Wait

controller

CPU clock (fCPU)

STOP

Clock for peripheral

hardware

PCC1

Internal bus

Processor clock

control register (PCC)

Selector

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 233 234

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