COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 34

• Manufacturer Part Number: COP8SA-DM
• Description: MODULE DEBUGGING FOR COP8SA
• Manufacturer: National Semiconductor

Specifications of COP8SA-DM

• Module/board Type: Debugger Module
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *COP8SA-DM

Saving and restoring of the microcontroller state during interrupts or when switching
between different tasks.
Example of an interrupt routine:
1-22
INTERRUPT;
PUSH
PUSH
PUSH
IFBIT
JP
IFBIT
JP
IFBIT
JP
EXIT
LD
POP
POP
POP
RETI
MICROCONTROLLER BASICS
A
CNTRL
PSW
0, IPND
TIMERINT
1, IPND
EXTERNALINT
2, IPND
SERIALINT
IPND, #00
PSW
CNTRL
A
; Save accumulator
; Save control register
; Save process status word
; If timer interrupt pending
; then jump to timer interrupt
; If external interrupt pending
; then jump to external interrupt
; If serial interrupt pending
; then jump to serial interrupt
; Exit from interrupt
; Clear pending bits
; Restore process status word
; restore control register
; Restore accumulator
; Return from interrupt