Program Example Of Dtp/External Interrupt Function - Fujitsu MB90895 Series Hardware Manual

12.6

Program Example of DTP/External Interrupt Function

This section gives a program example of the DTP/external interrupt function.
I Program Example of DTP/External Interrupt Function
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Processing specification
An external interrupt is generated by detecting the rising edge of the pulse input to the INT4 pin.
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Coding example
ICR06 EQU 0000B6H
DDR2 EQU 000012H
ENIR EQU 000030H
EIRR EQU 000031H
ELVRL EQU 000032H
ELVRH EQU 000033H
ER0 EQU EIRR:0
EN0 EQU ENIR:0
;
;---------Main program-------------------------------------
CODE CSEG
START:
MOV I:DDR2,#00000000B
AND CCR,#0BFH
MOV I:ICR06,#00H
CLRB I:EN4
MOV I:ELVRL,#00000010B ;INT4 is rising edge selection
CLRB I:ER4
SETB I:EN4
MOV ILM,#07H
OR CCR,#40H
LOOP:
User processing
BRA LOOP
;---------Interrupt program-------------------------------------
WARI:
CLRB
User processing
RETI
CODE ENDS
;---------Vector setting-----------------------------------------
VECT CSEG ABS=0FFH
ORG 00FFC0H
DSL WARI
ORG 00FFDCH
DSL START
DB 00H
VECT ENDS
END START
I:ER4
;DTP/external interrupt control register
;Port 2 direction register
;DTP/external interrupt enable register
;DTP/external interrupt factor register
;Detection level setting register: L
;Detection level setting register: H
;INT4 interrupt request flag bit
;INT4 interrupt request flag bit
;Stack pointer (SP),already initialized
;Setting DDR2 to input port
;Interrupt disabled
;Interrupt level 0 (highest)
;Disable INT4 at ENIR
;Interrupt request flag of INT4 in EIRR
;Clear
;Interrupt request enabled of INT4 in ENIR
;Setting ILM in PS to level 7
;Interrupts enabled
;Clear interrupt request flag
;Recovery from interrupt processing
;Setting vector to interrupt number #15(0F
;Reset vector setting
;Set to single chip mode
CHAPTER 12 DTP/external interrupt
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