Hardware manual

Rev. 3.0, 09/98, page 77 of 361
Section 5 Clock Pulse Generator
5.1 Overview
The H8/338 Series has a built-in clock pulse generator (CPG) consisting of an oscillator circuit, a
system (
φ
) clock divider, and a prescaler. The prescaler generates clock signals for the on-chip
supporting modules.
5.1.1 Block Diagram
XTAL
EXTAL
Ø/2 to Ø/4096
PrescalerDivider 2
Ø
CPG
Oscillator
circuit
Figure 5.1 Block Diagram of Clock Pulse Generator