MC81F4332 Datasheet, PDF (93/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

Example: Register save using push and pop instructions.
INTxx :
PUSH A
PUSH X
PUSH Y
;SAVE XCC.
;SAVE X REG.
;SAVE Y REG.
;; interrupt processing ;;
POP Y
POP X
POP A
RETI
;RESTORE Y REG.
;RESTORE X REG.
;RESTORE ACC.
;RETURN
General-purpose register save/restore using push and pop instructions;
MC81F4432
Figure 11-3 Saving/Restoring in Interrupt Routine
October 19, 2009 Ver.1.35
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