HD6432621 Hitachi, HD6432621 Datasheet - Page 719

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Section 20 Clock Pulse Generator
20.1
Overview
The H8S/2626 Series and H8S/2623 Series have an on-chip clock pulse generator (CPG) that
generates the system clock (ø), the bus master clock, and internal clocks.
The clock pulse generator consists of an oscillator, PLL (phase-locked loop) circuit, clock
selection circuit, medium-speed clock divider, bus master clock selection circuit, subclock
oscillator*, and waveform shaping circuit*. The frequency can be changed by means of the PLL
circuit in the CPG. Frequency changes are performed by software by means of settings in the
system clock control register (SCKCR) and low-power control register (LPWRCR).
Note: * Supported only in the H8S/2626 Series; not available in the H8S/2623 Series.
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