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Task-Specific Program Code
C-12
Example C–8. Testing and Using Interrupts INT2 and INT3 (intr23.asm)
* File: intr23.asm *
* Function: Interrupt test code *
* Interrupt on INT2 or INT3 will toggle IO3 and IO2 bits *
* and icr value copied in the Buffer @300 *
.title ” Interrupt 2/3 Test” ; Title
.copy ”init.h” ; Variable and register declaration
.copy ”vector.h” ; Vector label declaration
.text
start: clrc CNF ; Map block B0 to data memory
ldp #0h ; set DP=0
setc INTM ; Disable all interrupts
splk #0ffffh, ifr ; clear interrupts
splk #0002h, imr ; Enable int1 interrupts
splk #0003h, 60h
out 60h, icr ; Enable Int2 and 3 in ICR
splk #0000h, 60h
out 60h, wsgr ; Set zero wait states
splk #0e00ch, 60h ; configure the I03 and IO2 as outputs
out 60h, aspcr ; set the aspcr for the above
mar *, ar1 ; ARP=ar1
lar ar1, #rxbuf
lar ar0, #size ; set counter limit
splk #0004h, 61h ; set bit I/O 2
splk #0008h, 62h ; set bit I/O 3
splk #0063h, 63h ; set tx data
clrc intm
clrc xf
wait: out 61h, iosr ; toggle I/O 2
idle
clrc xf ; toggle xf bit
b wait
inpt23: in 65h, icr ; Read icr
in *+, icr ; Capture icr in buffer @300
mar *,ar0
banz skip, ar1
lar ar1, #rxbuf
lar ar0, #size
skip: out 62h, iosr ; toggle IO2/3
setc xf ; toggle xf
out 65h, icr ; clear interrupt 2/3 flag bit
clrc intm
ret
timer: ret
inpt1: ret
uart: ret
codtx: ret
codrx: ret
.end ; Assembler module end directive
; –optional