Program Example Of Interrupt Processing - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 3 INTERRUPT
3.11

Program Example of Interrupt Processing

An example of interrupt processing program is shown below.
Program Example of Interrupt Processing
Processing specification
An example interruption program that uses external interruption 0 (INT0)
Coding example
DDR6
ENIR
EIRR
ELVR
ICR03
STACK
RW
STACK_T
STACK
;----------Main Program------------------------------------------------------------
CODE
START:
LOOP:
106
EQU 000016H
EQU 00003CH
EQU 00003DH
EQU 00003EH
EQU 0000B3H
SSEG
100
RW 1
ENDS
CSEG
MOV RP, #0
MOV ILM, #07H
MOV A, #!STACK_T
MOV SSB, A
MOVW A, #STACK_T
MOVW SP, A
MOV DDR6,#00000000B
OR CCR, #40H
MOV I:ICR03, #00H
MOV I:ELVR, #00000001B
MOV I:EIRR, #00H
MOV I:ENIR, #01H
:
NOP
NOP
NOP
; Port 6 direction register
; Interruption/DTP permission register
; Interruption/DTP factor register (EIRR)
; A register to specify the required level
; Interrupt control register 03
; Stack
;
; Header bank used for general-purpose registers
; Sets ILM in PS to level 7
; Sets system stack
; Setting of stack pointer, in this case,
; S flag = 1, so set to SSP
; Sets the P60/INT0 pin for input
; Sets I flag of CCR in PS to enable interrupts.
; It is assumed interrupt levels 0(Max)
; Make INT0 "H" level request
; Clears interrupt cause for INT0.
; INT0 input permitted
; Dummy loop