HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 153

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

8.1 Overview
The H8/534 and H8/536 have a built-in clock pulse generator (CPG) consisting of an oscillator
circuit, a system (ø) clock divider, an E clock divider, and a group of prescalers. The prescalers
generate clock signals for the on-chip supporting modules.
8.1.1 Block Diagram
8.2 Oscillator Circuit
If an external crystal is connected across the EXTAL and XTAL pins, the on-chip oscillator circuit
generates a clock signal for the system clock divider. Alternatively, an external clock signal can
be applied to the EXTAL pin.
Connecting an External Crystal
(1) Circuit Configuration: An external crystal can be connected as in the example in figure 8-2.
EXTAL
An AT-cut parallel resonating crystal should be used.
XTAL
Oscillator
circuit
Figure 8-1 Block Diagram of Clock Pulse Generator
Section 8 Clock Pulse Generator
Divider
÷ 2
135
ø
Divider
÷ 8
E
CPG
Prescalers
ø/2 to ø/4096