R8C16 datasheet(63/279 Pages) RENESAS

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R8C/16 Group, R8C/17 Group

9. Clock Generation Circuit

Rev.2.10

Jan 19, 2006

Page 50 of 254

REJ09B0169-0210

9.4.2.4

Exiting Wait Mode

The microcomputer exits 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

“000b” (interrupts disabled) before executing the WAIT instruction.

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 can be used to exit wait mode.

Table 9.3 lists Interrupts to Exit Wait Mode and Usage Conditions.

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

the WAIT instruction.

(1) Set the interrupt priority level to the ILVL2 to ILVL0 bits in the interrupt control register of the

peripheral function interrupts to use for exiting wait mode. Set the ILVL2 to ILVL0 bits of the

peripheral function interrupts not to use for exiting wait mode to “000b” (disables interrupt).

(2) Set the I flag to “1”.

(3) Operate the peripheral functions to use for exiting wait mode.

When an interrupt request is generated and the CPU clock supply is started if exiting by the

peripheral function interrupt, an interrupt sequence is executed.

The CPU clock, when exiting wait mode by a peripheral function interrupt, is the same clock as the

CPU clock when the WAIT instruction is executed.

Table 9.3

Interrupts to Exit Wait Mode and Usage Conditions

Interrupt

CM02=0

CM02=1

Serial Interface Interrupt

Usable when operating with

internal or external clocks

Usable when operating with external

clock

IIC Interrupt

Usable in all modes

−(Do not use)

Key Input Interrupt

Usable

A/D Conversion Interrupt

Usable in one-shot mode

−(Do not use)

Timer X Interrupt

Usable in all modes

Usable in event counter mode

Timer Z Interrupt

Usable in all modes

−(Do not use)

Timer C Interrupt

Usable in all modes

−(Do not use)

INT Interrupt

Usable

Usable (INT0 and INT3 are usable if

there is no filter.

Voltage Monitor 2 Interrupt

Usable

Oscillation Stop Detection

Interrupt

Usable

−(Do not use)

Watchdog Timer Interrupt

Usable in count source protect

mode

Usable in count source protect mode

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