SH7014 Datasheet, PDF (87/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

4. Clock Pulse Generator (CPG)
Section 4 Clock Pulse Generator (CPG)
4.1 Overview
This LSI has an on-chip clock pulse generator (CPG) that generates the system clock (φ), as well
as the internal clock (φ/2 to φ/8192). The CPG consists of an oscillator, a PLL, and a prescaler.
4.1.1 Block Diagram
A block diagram of the clock pulse generator is shown in figure 4.1.
PLLCAP
CK
EXTAL
XTAL
Oscillator PLL circuit
MD2
MD3
Clock mode
control circuitry
Prescaler
φ
φ/2 to
φ/8192
Within the LSI
Figure 4.1 Block Diagram of the Clock Pulse Generator
Rev.5.00 Sep. 27, 2007 Page 53 of 716
REJ09B0398-0500