7721 datasheet(533/577 Pages) RENESAS

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7721 Datasheet(PDF) 533 Page - Renesas Technology Corp

Part #	7721

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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533 / 577 page

APPENDIX

Appendix 9. 7721 Group Q & A

7721 Group User’s Manual

17–70

Interrupt

(2/2)

To prevent this problem, after change of the interrupt priority level is completed, use software to

execute the routine that should not accept a certain interrupt request. The following shows a sample

program.

[ Sample program]

After an instruction which writes “0002” to the interrupt priority level select bits, fill the instruction

queue buffer with the NOP instruction to make the next instruction not to be executed before the

writing is completed.

LDM #00H, XXXIC ; Sets the interrupt priority level select bits to “0002.”

NOP

;

NOP

;

NOP

;

LDA A,DATA

; Instruction at the beginning of the routine that should not accept a certain

interrupt request

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