M32CSLASH8A datasheet(103/372 Pages) RENESAS

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M32C/8A Group

9. Clock Generation Circuits

Rev.1.00

Jul 15, 2007

Page 86 of 352

REJ09B0385-0100

9.5.1.1

Main Clock Mode

The main clock divided by 1 (no division), 2, 3, 4, 6, 8, 10, 12, 14, or 16 is used as the source for the CPU clock.

The main clock is also used as the source for fPFC. When the sub clock is running, fC32 can be used as the

count source for timer A and timer B.

9.5.1.2

PLL Mode

The PLL clock divided by 1 (no division), 2, 3, 4, 6, 8, 10, 12, 14, or 16 is used as the source for the CPU clock.

The PLL clock is also used as the source for fPFC. When the sub clock is running, fC32 can be used as the

count source for timer A and timer B.

9.5.1.3

Low-Speed Mode

The sub clock is used as the source for the CPU clock. The main clock, PLL clock, or on-chip oscillator clock is

used as the source for fPFC. fC32 can be used as the count source for timer A and timer B.

9.5.1.4

Low-Power Consumption Mode

The MCU enters low-power consumption mode when the main clock stops in low-speed mode. The sub clock is

used as the source for the CPU clock, and the on-chip oscillator clock is used as the source for fPFC. fC32 can

be used as the count source for timer A and timer B. In low-power consumption mode, bits MCD4 to MCD0 in

the MCD register become 01000b (divide-by-8 mode). Therefore, next time the CPU clock source is switched

to the main clock, the CPU clock is the main clock divided by eight.

9.5.1.5

On-Chip Oscillator Mode

The on-chip oscillator clock divided by 1 (no division), 2, 3, 4, 6, 8, 10, 12, 14, or 16 is used as the source for

the CPU clock. The on-chip oscillator clock is also used as the source for fPFC. When the sub clock is running,

fC32 can be used as the count source for timer A and timer B.

9.5.1.6

On-Chip Oscillator Low-power Consumption Mode

The MCU enters on-chip oscillator low-power consumption mode when the main clock stops in on-chip

oscillator mode. The on-chip oscillator clock divided by 1 (no division), 2, 3, 4, 6, 8, 10, 12, 14, or 16 is used as

the source for the CPU clock. The on-chip oscillator clock is also used as the source for fPFC. When the sub

clock is running, fC32 can be used as the count source for timer A and timer B.

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