M32CSLASH8A datasheet(352/372 Pages) RENESAS

352 / 372 page

M32C/8A Group

24. Usage Notes

Rev.1.00

Jul 15, 2007

Page 335 of 352

REJ09B0385-0100

24.3.4.2

Stop Mode

• The MCU cannot enter stop mode if a low-level (“L”) signal is applied to the NMI pin. Apply an “H” signal

to enter stop mode.

• To exit stop mode by reset, apply an “L” signal to RESET pin until a main clock oscillation stabilizes.

• If using the NMI interrupt to exit stop mode, use the following procedure to set the CM10 bit in the CM1

(Technical update: TN-16C-127A/EA)

(1) Exit stop mode using the NMI interrupt.

(2) Generate a dummy interrupt.

(3) Set the CM10 bit to 1 (all clocks stopped).

e.g.,

int

#63

; dummy interrupt

bset

CM1

; all clocks stopped

/*dummy interrupt routine*/

dummy

reit

• When entering stop mode, the instructions following CM10 = 1 instruction are stored into the instruction

queue, and the program stops. When stop mode is exited, the instruction lined in the queue is executed

before the exit interrupt routine is handled. Insert a jmp.b instruction as follows after the instruction to set

the CM10 bit is set to 1.

(Technical update: TN-16C-124A/EA)

fset I

; I flag is set to 1

bset 0, cm1

; all clocks stopped (stop mode)

jmp.b LABEL_001

; jmp.b instruction executed (no instruction between jmp.b and LABEL.)

LABEL_001:

nop

; nop(1)

nop

; nop(2)

nop

; nop(3)

nop

; nop(4)

mov.b #0, prcr

; protection set

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