Renesas Single-Chip Microcomputer M37531T-ADS Technical Information PDF herunterladen (Seite 36)

No.M16C-25-9905

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3.2 When using only hardware reset or NMI interrupt to cancel the STOP or WAIT

modes, use the following algorithm to enter the STOP or WAIT modes.

; Disable interrupt

WAIT instruction or all clock stop control bit set

; Disable maskable interrupt

Set the interrupt enable flag (I flag) to “0”

Change all interrupt priority levels to 0

Insert 4 NOP instructions

; NOP instructions are required because M16C instruction queue reads forward 4

bytes from wait or stop instruction when program is stopped.

; Set the bit 0 of protect register to “1” before set the all clock stop control bit to “1” .

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Renesas Single-Chip Microcomputer M37531T-ADS Technical Information Seite 36