CPGS312B_000020020100
Rev. 2.00, 09/03, page 271 of 690
Section 9 Clock Pulse Generator (CPG)
This LSI has a clock pulse generator (CPG) that generates an internal clock (I
φ
), a peripheral clock
(P
φ
), and a bus clock (B
φ
). The CPG consists of oscillators, PLL circuits, and divider circuits.
9.1
Features
•
Seven clock modes
Selection of seven clock modes depending on the frequency ranges and crystal oscillation or
external clock input.
•
Three clocks generated independently
An internal clock for the CPU and cache (I
φ
); a peripheral clock (P
φ
) for the peripheral
modules; a bus clock (B
φ
= CKIO) for the external bus interface.
•
Frequency change function
Internal and peripheral clock frequencies can be changed independently using the phase-locked
loop (PLL) circuit and divider circuit within the CPG. Frequencies are changed by software
using the frequency control register (FRQCR) settings.
•
Power-down mode control
The clock can be stopped for sleep mode and software standby mode and specific modules can
be stopped using the module standby function.
A block diagram of the CPG is shown in figure 9.1.
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