HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 877

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

20.1
The chip has an on-chip clock pulse generator (CPG) that generates the system clock (φ), the bus
master clock, and internal clocks.
The clock pulse generator consists of an oscillator circuit, a duty adjustment circuit, a medium-
speed clock divider, and a bus master clock selection circuit.
In the chip, the CPG has a medium-speed mode in which the bus master runs on a medium-speed
clock and the other supporting modules run on the high-speed clock, and a function that allows the
medium-speed mode to be disabled and the clock division ratio to be changed for the entire chip.
A clock from φ/2 to φ/32 can be selected.
20.1.1
Figure 20.1 shows a block diagram of the clock pulse generator.
EXTAL
XTAL
Overview
Block Diagram
Oscillator
Figure 20.1 Block Diagram of Clock Pulse Generator
Section 20 Clock Pulse Generator
adjustment
circuit
Duty
System clock
to φ pin
speed clock
Medium-
divider
Rev.4.00 Sep. 07, 2007 Page 847 of 1210
φ/2 to φ/32
Internal clock
to supporting
modules
DIV
Bus master
selection
SCKCR
circuit
clock
REJ09B0245-0400
Bus master clock
to CPU, DTC,
and DMAC
SCK2 to SCK0