HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 371

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

This LSI has a clock pulse generator (CPG) that generates an internal clock (Iφ), a peripheral clock
(Pφ), and a bus clock (Bφ). The CPG consists of an oscillator, PLL circuit, and divider circuit.
11.1
• Three clock modes
• Three clocks generated independently
• Frequency change function
• Power-down mode control
Selection of three clock modes by frequency range, turning on and off the PLL, a direct
connection to a crystal unit, and external clock input.
An internal clock for the CPU and cache (Iφ); a peripheral clock (Pφ) for the on-chip circuits; a
bus clock (Bφ = CKIO) for the external bus interface.
Internal and peripheral clock frequencies can be changed independently using the PLL (phase
locked loop) circuit and divider circuit within the CPG. Frequencies are changed by software
using frequency control register (FRQCR) settings.
The clock can be stopped for sleep mode and software standby mode and specific modules can
be stopped using the module standby function.
Features
Section 11 Clock Pulse Generator (CPG)
Rev. 1.00, 02/04, page 333 of 804