HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 225

• Manufacturer Part Number: HD6417618
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

This LSI has a clock pulse generator (CPG) that generates an internal clock (Iφ), a peripheral clock
(Pφ), a bus clock (Bφ) and a clock (Mφ) for an IEEE802.3-PHY (physical layer device),
hereinafter called PHY-LSI. The CPG consists of an oscillator, PLL circuits, and divider circuits.
8.1
• Four clock modes
• Four clocks generated independently
• Frequency change function
• Power-down mode control
CPGS301C_000020030900
Selection of four clock modes depending on the frequency of a clock source and whether a
crystal resonator or external clock input is in use.
An internal clock (Iφ) for the CPU and cache; a peripheral clock (Pφ) for the on-chip
peripheral modules; a bus clock (Bφ = CKIO) for the external bus interface; and a clock (Mφ)
for the PHY-LSI.
Frequencies of the internal clock, peripheral clock, and clock for the PHY-LSI can be changed
independently using the PLL circuit and divider circuit within the CPG. Frequencies are
changed by software using the frequency control register (FRQCR) and PHY-LSI clock
frequency control register (MCLKCR) settings.
The clock can be stopped in sleep mode and software standby mode and specific modules can
be stopped using the module standby function.
Features
Section 8 Clock Pulse Generator (CPG)
Rev. 6.00 Jun. 12, 2007 Page 193 of 610
Section 8 Clock Pulse Generator (CPG)
REJ09B0131-0600