M32CSLASH8B datasheet(102/406 Pages) RENESAS

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Under development

M32C/8B Group

9. Clock Generation Circuits

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 85 of 385

9.5.1.8

Main Voltage Regulator Stops

Power consumption can be reduced by stopping the main voltage regulator in low-power consumption mode.

To stop the main voltage regulator, set the MRS bit in the VRCR register to 1 (main voltage regulator stops)

after all the following conditions are met.

(1) Low-power consumption mode

(2) On-chip oscillator stops

•The CM21 bit in the CM2 register is set to 0

•The PM22 bit in the PM2 register is set to 0

•Bits PM27 and PM26 in the PM2 register are set to 00b

(3) The FMR40 bit in the FMR4 register is set to 1 (flash memory low-speed access)

Set the MRS bit to 0 (main voltage regulator operates) and wait for 50

μs or more before performing any of the

following settings: changing CPU operating mode to other than low-power consumption mode, starting the on-

chip oscillator, or setting the FMR40 bit 0 (flash memory normal-speed access).

Table 9.6

Operation Mode Setting

NOTE:

1. The CM21 bit in the CM2 register has both the oscillation control and selector functions.

CPU Clock

Source

Operating Mode

Oscillation Control

Selector

CM0 Register

PLC0

CM2

CM1

CM0

CM05

CM04

PLC07

CM21(1)

CM17

CM07

Main clock

Main clock mode

0 or 1

PLL clock

PLL mode

0 or 1

1010

Sub clock

Low-speed mode

0 or 1

Low power

consumption mode

10001

On-chip

oscillator clock

On-chip oscillator mode

0 or 1

On-chip oscillator low-

power consumption

mode

0 or 1

0100

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