Renesas 7700 FAMILY User Manual page 525

APPENDIX
Appendix 9. Q & A
A
To prevent this problem, use software to execute the routine that should not accept a certain interrupt
request after change of interrupt priority level is completed. The following shows a sample program.
[ Sample program ]
After an instruction which writes "000
tion queue buffer with the NOP instruction to make the next instruction not be executed before the
writing is completed.
:
LDM #00H, XXXIC ; Sets the interrupt priority level select bits to "000
NOP
NOP
NOP
LDA A,DATA
20–74
" to the interrupt priority level select bits, fill the instruc-
2
;
;
;
; Instruction at the beginning of the routine that should not accept a certain
interrupt request
7751 Group User's Manual
Interrupt
."
2
(2/2)