Chapter 5 Clock Generator; Clock Generator Functions; Clock Generator Configuration; Block Diagram Of Clock Generator - NEC switch User Manual

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.
Item
Control register Processor clock control register (PCC)
Oscillator System clock oscillator
X1
System
clock oscillator
X2
STOP
CHAPTER 5 CLOCK GENERATOR
Table 5-1. Configuration of Clock Generator
Figure 5-1. Block Diagram of Clock Generator
Prescaler
f
X
f
X
2
2
PCC1
Processor clock
control register (PCC)
Internal bus
User's Manual U12978EJ3V0UD
Configuration
Prescaler
Standby Wait
controller controller
Clock for peripheral
hardware
CPU clock (f )
CPU
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