R8C2K datasheet(107/471 Pages) RENESAS

107 / 471 page

R8C/2K Group, R8C/2L Group

10. Clock Generation Circuit

Rev.1.10

Dec 21, 2007

Page 90 of 450

REJ09B0406-0110

10.4.3.3

Exiting Stop Mode

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

Figure 10.12 shows the Time from Stop Mode to Interrupt Routine Execution.

When using a peripheral function interrupt to exit stop mode, set up the following before setting the CM10 bit

to 1.

(1) Set the interrupt priority level in bits ILVL2 to ILVL0 of the peripheral function interrupts to be used for

exiting stop mode. Set bits ILVL2 to ILVL0 of the peripheral function interrupts that are not to be used for

exiting stop mode to 000b (interrupt disabled).

(2) Set the I flag to 1.

(3) Operates the peripheral function to be used for exiting stop mode.

When exiting by a peripheral function interrupt, the interrupt sequence is executed when an interrupt request is

generated and the CPU clock supply is started.

If the clock used immediately before stop mode is a system clock and stop mode is exited by a peripheral

function interrupt, the CPU clock becomes the previous system clock divided by 8.

Figure 10.12

Time from Stop Mode to Interrupt Routine Execution

Time until Flash Memory

is Activated (T2)

Time until CPU Clock

is Supplied (T3)

Time for Interrupt

Sequence (T4)

Remarks

Flash memory

activation sequence

CPU clock restart

sequence

Interrupt sequence

Oscillation time of

CPU clock source

used immediately

before stop mode

Stop

mode

Internal

power

stability time

Interrupt

request

generated

150 µs

(max.)

FMSTP Bit

FMR0 Register

(flash memory

operates)

(flash memory stops)

Period of CPU clock

× 6 cycles

Period of CPU clock

× 20 cycles

Following total

time of T0 to T4

is the time from

stop mode until

an interrupt

handling is

executed.

Period of XIN clock

× 12 cycles + 30 µs (max.)

Period of XIN clock

× 12 cycles

Same as above

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