M32CSLASH8B datasheet(105/406 Pages) RENESAS

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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 88 of 385

Figure 9.17

Procedure to Enter Wait Mode

Set an interrupt priority level of each interrupt

RLVL register: bits RLVL2 to RLVL0 = 7

Set the interrupt priority level (ILVL2 to ILVL0) of

the interrupt used to exit wait mode

I flag = 0

(1) Initial setting

Set the interrupt priority level of the interrupts,

which are not used to exit wait mode, to 0

FLG register: set IPL

Bits RLVL2 to RLVL0 = the same level as IPL

Select the operating mode from the following:

-main clock mode

-low-speed mode

-low-power consumption mode

-on-chip oscillator mode

-on-chip oscillator low-power consumption mode

I flag = 1

Execute the WAIT instruction

(Note 1)

(2) Before entering wait mode

Wait mode

RLVL register: bits RLVL2 to RLVL0 = 7

(3) After exiting wait mode

NOTE:

1. Insert at least 4 NOP's after WAIT instruction.

Start

End

Set the wait/stop mode exit interrupt priority level to 7.

Interrupt disabled

Set the processor interrupt priority level (IPL)*

Set the exit interrupt priority level (RLVL2 to RLVL0)*

Interrupt enabled

Set the exit priority level as soon as exiting wait mode

To further reduce power consumption, use the

following procedure in low-power consumption mode

before entering wait mode

-Stops all clock oscillations except sub clock

-Set the flash memory to low-speed access

-Stops main voltage regulator

(Refer to Figure

Procedure to Enter Low-Power

Consumption Mode From Main Clock Mode)

(ILVL2 to ILVL0) > IPL* = (RLVL2 to RLVL0)*

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