Program Example Of Interrupt Processing - Fujitsu MB90335 Series Hardware Manual

MB90335 Series
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:
CM44-10137-6E
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
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 3 INTERRUPT
3.11 Program Example of Interrupt Processing
; 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
105