Intel 80C188EC User Manual page 286

_CMPB equ word ptr[bp+6]
push ax
push dx
mov dx, T1CNT
xor ax, ax
out dx, al
mov dx, T1CMPA
mov ax, 1
out dx, al
mov dx, T1CMPB
mov ax, _CMPB
out dx, al
mov dx, T1CON
mov ax, C002H
out dx, al
CountDown: in ax, dx
test ax, MaxCount
jz CountDown
and ax, not MaxCount
out dx, al
pop dx
pop ax
pop bp
ret
_one_shot endp
lib_80186 ends
end
Example 9-3. Configuring a Digital One-Shot (Continued)
;get parameter off the stack
;save registers that will be
;modified
;Clear Timer 1 Counter
;set time before t_shot to 0
;set pulse time
;start Timer 1
;read in T1CON
;max count occurred?
;no: then wait
;clear max count bit
;update T1CON
;restore saved registers
;restore caller's bp
TIMER/COUNTER UNIT
9-23