R8C datasheet(35/199 Pages) RENESAS

35 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 25 of 180

REJ09B0019-0120

6.4.2 Wait Mode

In wait mode, the CPU clock is turned off, so are the CPU and the watchdog timer because both are

operated by the CPU clock. Because the main clock and on-chip oscillator clock both are on, the

peripheral functions using these clocks keep operating.

• Peripheral Function Clock Stop Function

If the CM02 bit is “1” (peripheral function clocks turned off during wait mode), the f1, f2, f8, f32, f1SIO,

f8SIO, f32SIO, and fAD clocks are turned off when in wait mode, with the power consumption reduced

that much.

• Entering Wait Mode

The microcomputer is placed into wait mode by executing the WAIT instruction.

• Pin Status During Wait Mode

The status before wait mode is retained.

• Exiting Wait Mode

The microcomputer is moved out of wait mode by a hardware reset or peripheral function interrupt.

When using a hardware reset to exit wait mode, set the ILVL2 to ILVL0 bits for the peripheral function

interrupts to “0002” (interrupts disabled) before executing the WAIT instruction.

The peripheral function interrupts are affected by the CM02 bit. If CM02 bit is “0” (peripheral function

clocks not turned off during wait mode), all peripheral function interrupts can be used to exit wait

mode. If CM02 bit is “1” (peripheral function clocks turned off during wait mode), the peripheral

functions using the peripheral function clocks stop operating, so that only the peripheral functions

clocked by external signals can be used to exit wait mode.

Table 6. 3 lists the interrupts to exit wait mode and the usage conditions.

When using a peripheral function interrupt to exit wait mode, set up the following before executing

the WAIT instruction.

1. In the ILVL2 to ILVL0 bits in the interrupt control register, set the interrupt priority level of the

peripheral function interrupt to be used to exit wait mode.

Also, for all of the peripheral function interrupts not used to exit wait mode, set the ILVL2 to ILVL0

bits to “0002” (interrupt disable).

2. Set the I flag to “1”.

3. Enable the peripheral function whose interrupt is to be used to exit wait mode.

In this case, when an interrupt request is generated and the CPU clock is thereby turned on, an

interrupt sequence is executed.

The CPU clock turned on when exiting wait mode by a peripheral function interrupt is the same CPU

clock that was on when the WAIT instruction was executed.

Interrupt

CM02=0

CM02=1

Serial interface interrupt

Can be used when operating with internal

or external clock

Can be used when operating with external clock

Key input interrupt

Can be used

A/D conversion interrupt

Can be used in one-shot mode

Timer X interrupt

Can be used in all modes

Can be used in event counter mode

Timer Y interrupt

(Do not use)

Can be used when counting inputs from CNTR1 pin

in timer mode

Can be used in all modes

INT interrupt

Can be used

Can be used (INT0 and INT3 can be used if there

is no filter.

Voltage detection interrupt

Can be used

Oscillation stop detection

interrupt

Can be used

(Do not use)

Timer Z interrupt

Can be used in all modes

(Do not use)

Timer C interrupt

Can be used in all modes

(Do not use)

Table 6.3 Interrupts to Exit Wait Mode and Usage Conditions

6.4 Power Control

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