M38K09RFS datasheet(227/328 Pages) RENESAS

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2.12 Standby function

Rev.2.00

Oct 05, 2006

page 98 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

Fig. 2.12.4 Execution sequence example at restoration by occurrence of INT0 interrupt request

(3)

Notes on using stop mode

sRegister setting

Since values of the prescaler 12 and Timer 1 are automatically reloaded when returning from the

stop mode, set them again, respectively. (When the oscillation stabilizing time set after STP

instruction released bit is “0”)

sClock restoration

When the main clock side is set as a system clock, the oscillation stabilizing time for approximately

8,000 cycles of the XIN input is reserved at restoration from the stop mode.

Stop mode

XIN

(System clock)

INT0 pin

Prescaler 12 counter

Timer 1 counter

INT0 interrupt request bit

Peripheral device

CPU

Operating

Stopped

Operating

512 counts

Oscillation stabilizing time

XIN; H

FF16

0116

Execute STP

instruction

INT0 interrupt signal

input (INT0 interrupt

request occurs)

Oscillation start

Prescaler 12 count start

512 counts down by

prescaler 12

Start supplying internal

clock

φ to CPU

Accept INT0 interrupt

request

Note: f(XIN)/16 is input as the prescaler 12 count source.

qWhen restoring microcomputer from stop mode by INT0 interrupt (rising edge selected)

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