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CHAPTER 17 DTP/EXTERNAL INTERRUPTS
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
#26(1A
H
)
DSL WARI
ORG 00FFDCH ;Reset vector set
DSL START
DB 00H ;Set to single-chip mode
VECT ENDS
END START
■ Program Example of DTP Function
●
Processing specification
• Channel 0 of the EI
2
OS is started by detecting the High level of the signal input to the INT8 pin.
• RAM data is outputted to port 5 by performing DTP processing (EI
2
OS).
●
Coding example
ICR07 EQU 0000B7H ;DTP/external interrupt control
register
DDR6 EQU 000016H ;Port 6 direction register
DDR5 EQU 000015H ;Port 5 direction register
ENIR1 EQU 0000CAH ;DTP/external interrupt enable
register 1
EIRR1 EQU 0000CBH ;DTP/external interrupt factor
register 1
ELVR1L EQU 0000CCH ;Detection level setting register 1:"L"
ELVR1H EQU 0000CDH ;Detection level setting register 1:"H"
ADER5 EQU 00000BH ;Port5 analog input enable register
ADER6 EQU 00000CH ;Port6 analog input enable register
ER1 EQU EIRR:0 ;INT8 interrupt request flag bit
EN1 EQU ENIR:0 ;INT8 interrupt request enable bit
;
BAPL EQU 000100H ;Buffer address pointer lower
BAPM EQU 000101H ;Buffer address pointer middle
BAPH EQU 000102H ;Buffer address pointer higher
ISCS EQU 000103H ;EI
2
OS status register
IOAL EQU 000104H ;I/O address register lower
IOAH EQU 000105H ;I/O address register higher
DCTL EQU 000106H ;Data counter lower
DCTH EQU 000107H ;Data counter higher