R8CSLASH2G datasheet(121/344 Pages) RENESAS

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R8C/2G Group

11. Clock Generation Circuit

Rev.1.00

Apr 04, 2008

Page 101 of 318

REJ09B0387-0100

11.4.2

Wait Mode

Since the CPU clock stops in wait mode, the CPU, which operates using the CPU clock, and the watchdog

timer, when count source protection mode is disabled, stop. The XCIN clock and on-chip oscillator clock do not

stop and the peripheral functions using these clocks continue operating.

11.4.2.1

Peripheral Function Clock Stop Function

If the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the f1, f2, f4, f8, and f32 clocks stop

in wait mode. This reduces power consumption.

11.4.2.2

Entering Wait Mode

The MCU enters wait mode when the WAIT instruction is executed.

11.4.2.3

Pin Status in Wait Mode

The I/O port is the status before wait mode was entered is maintained.

11.4.2.4

Exiting Wait Mode

The MCU exits wait mode by a reset or a peripheral function interrupt.

The peripheral function interrupts are affected by the CM02 bit. When the CM02 bit is set to 0 (peripheral

function clock does not stop in wait mode), all peripheral function interrupts can be used to exit wait mode.

When the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the peripheral functions using the

peripheral function clock stop operating and the peripheral functions operated by external signals or on-chip

oscillator clock can be used to exit wait mode.

Table 11.3 lists Interrupts to Exit Wait Mode and Usage Conditions.

Table 11.3

Interrupts to Exit Wait Mode and Usage Conditions

Interrupt

CM02 = 0

CM02 = 1

Serial interface interrupt

Usable when operating with

internal or external clock

Usable when operating with external

clock

Key input interrupt

Usable

Timer RA interrupt

Usable in all modes

Can be used if there is no filter in

event counter mode.

Usable by selecting fOCO or fC32 as

count source.

Timer RB interrupt

Usable in all modes

(Do not use)

Timer RE interrupt

Usable in all modes

Usable when operating in real time

clock mode

Timer RF interrupt

Usable in all modes

(Do not use)

INT0, INT1, INT2, INT4 interrupt Usable

Can be used if there is no filter

Voltage monitor 1 interrupt

Usable

Voltage monitor 2 interrupt

Usable

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