M32CSLASH8B datasheet(103/406 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 86 of 385

Figure 9.16

Procedure to Enter Low-Power Consumption Mode From Main Clock Mode

PRCR register

PRC0 bit = 1

I flag = 1

End

Enable writing to registers associated

with clocks

Interrupt enabled

Start

PLC register

PLC07 bit = 0

PLL stops

PD8 register

PD8_7 bit = 0

PD8 register

PD8_6 bit = 0

Set ports P8_7 and P8_6 to input mode

PUR2 register

PU25 bit = 0

Not pulled up

CM0 register

CM05 bit = 1

Main clock stops

CM0 register

CM03 bit = 1

CM0 register

CM04 bit = 1

Sub clock oscillates

Wait for sub clock oscillation to stablize

CM0 register

CM07 bit = 1

Select the sub clock as the CPU clock

source

Disable writing to registers associated

with clocks

CM2 register

CM20 bit = 0

Oscillation stop detect function not used

I flag = 0

Interrupt disabled

FMR4 register = 00h

Flash memory normal-speed access

FMR4 register = 01h

PRCR register

PRC3 bit = 1

Enable writing to the VRCR register

VRCR register

MRS bit = 1

Main voltage regulator stops

PRCR register

PRC3 bit = 0

Disable writing to the VRCR register

VRCR register

MRS bit = 0

Main voltage regulator operates

PRCR register

PRC3 bit = 0

Disable writing to the VRCR register

FMR4 register = 00h

Flash memory low-speed access

Entering from main clock

mode to low-power

consumption mode

To further reduce power

consumption in low-power

consumption mode

PRCR register

PRC0 bit = 0

Processing in low-power consumption mode

CM2 register

CM21 bit = 0

Select the main clock as the CPU clock

source

Configuration to oscillate

sub clock

PM2 register

PM22 bit = 0

PM2 register

Bits PM27 and PM26 = 00b

On-chip oscillator stops

Wait for 50µs or more

Wait for main voltage regulator

to stablize

PRCR register

PRC3 bit = 1

Enable writing to the VRCR register

Entering from low-power

consumption mode to the

other modes

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