HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 97

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

This LSI has an on-chip clock pulse generator (CPG) that generates the system clock (φ) and the
peripheral clock (Pφ), and then makes internal clock (φ/2 to φ/8192 and Pφ/2 to Pφ/1024) out of
this generated clock. The CPG consists of an oscillator, PLL circuit, and pre-scaler. A block
diagram of the clock pulse generator is shown in figure 4.1. The frequency from the oscillator can
be modified by the PLL circuit.
CPG0111A_010120030800
PLLCAP
EXTAL
XTAL
MD2
MD3
Figure 4.1 Block Diagram of Clock Pulse Generator
CK
Section 4 Clock Pulse Generator
Oscillator
control circuitry
Clock mode
PLL circuit
φ
Pre-scaler
Clock divider
φ/2 to
φ/8192
(× 1/2)
for internal circuit
Rev.4.00 Mar. 27, 2008 Page 53 of 882
Pre-scaler
Pφ/2 to
Pφ/1024
4. Clock Pulse Generator
Pφ
REJ09B0108-0400