Program Example For External Interrupt Circuit - Fujitsu F2MC-8L MB89620 Series Hardware Manual

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12.

Program Example for External Interrupt Circuit

This section gives a program example for the external interrupt circuit.
n Program Example for External Interrupt Circuit
l Processing description
•
Coding example
l
EIC1
EIR1
SEL1
EIE1
ILR1
INT_V
IRQ1
INT_V
;-----Main program----------------------------------------------------------------------------------------------------------------------------------------
;-----Interrupt processing routine----------------------------------------------------------------------------------------------------------------------
WARI
;---------------------------------------------------------------------------------------------------------------------------------------------------------------
242
CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT (EDGE)
Generates interrupts on detecting a rising edge on pulses input to the INT1 pin.
EQU 0024H
EQU EIC1:7
EQU EIC1:5
EQU EIC1:4
EQU 007CH
DSEG ABS
ORG 0FFFAH
DW WARI
ENDS
CSEG
:
CLRI
CLRB EIR1
MOV ILR1,#11110111B
CLRB SEL1
SETB EIE1
SETI
:
CLRB EIR1
PUSHW A
XCHW A,T
PUSHW A
:
User processing
:
POPW A
XCHW A,T
POPW A
RETI
ENDS
END
; Address of the external interrupt 1 control register
; Define the external interrupt request flag bit.
; Define the edge polarity selection bit.
; Define the interrupt request enable bit.
; Address of the set interrupt level setting register 1
; [DATA SEGMENT]
; Set interrupt vector.
; [CODE SEGMENT]
; Stack pointer (SP) etc. are already initialized.
; Disable interrupts.
; Clear interrupt request flag.
; Set interrupt level (level 1).
; Select rising edge.
; Enable interrupt request output.
; Enable interrupts.
; Clear external interrupt request flag.
MB89620 series