HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 273

• Manufacturer Part Number: HD6433308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

16.1 Overview
The H8/330 chip has a built-in clock pulse generator (CPG) consisting of an oscillator circuit, a
system (Ø) clock divider, an E clock divider, and a prescaler. The prescaler generates clock signals
for the on-chip supporting modules.
16.1.1 Block Diagram
16.2 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.
(1) Connecting an External Crystal
An AT-cut parallel resonating crystal should be used.
EXTAL
XTAL
Circuit Configuration: An external crystal can be connected as in the example in Figure 16-2.
Oscillator
circuit
Figure 16-1. Block Diagram of Clock Pulse Generator
Section 16. Clock Pulse Generator
Divider
÷ 2
265
Ø
Divider
÷ 8
E
CPG
Prescaler
Ø/2 to Ø/4096