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CHAPTER 17 DTP/EXTERNAL INTERRUPTS
;
;---------Main program-------------------------------------
CODE CSEG
START: ;Stack pointer (SP) already initialized
MOV I:ADER5,#00000000B ;Set analog input of port5 to disable
MOV I:ADER6,#00000000B ;Set analog input of port6 to disable
MOV I:DDR6,#11111111B ;Set DDR6 to output port
MOV I:DDR5,#00000000B ;Set DDR5 to input port
AND CCR,#0BFH ;Interrupts disabled
MOV I:ICR07,#08H ;Interrupt level 0 (highest) EI
2
OS
;Channel 0
;Data bank register (DTB) = 00H
MOV BAPL,#00H ;Address for storing output data set
MOV BAPM,#06H ;(600
H
to 60A
H
used)
MOV BAPH,#00H
MOV ISCS,#12H ;Byte transfer, buffer address +1,
;I/O address fixed,
;transfer from memory to I/O
MOV IOAL,#00H ;Set port 0 as transfer destination
MOV IOAH,#00H ;address pointer
MOV DCTL,#0AH ;Set transfer count to 10
MOV DCTH,#00H
;
CLRB I:EN8 ;INT8 disabled using ENIR1
MOV I:ELVR1L,#00000001B;H level detection set for INT8
CLRB I:ER8 ;INT8 interrupt request flag cleared
;using EIRR1
SETB I:EN8 ;INT8 interrupt request enabled using
ENIR1
MOV ILM,#07H ;Set ILM in PS to level 7
OR CCR,#40H ;Interrupts enabled
LOOP:
ÅE
Processing by user
ÅE
BRA LOOP
;---------Interrupt program-------------------------------------
WARI:
CLRB I:ER8 ;INT8 interrupt request flag cleared
ÅE
Processing by user
ÅE
RETI ;Return from interrupt processing
CODE ENDS
;---------Vector setting------------------------------------------
VECT CSEG ABS=0FFH
ORG 00FF94H ;Set vector to interrupt number