Microprocessor_Lab/LAB 5/TASK 6 at main · Ghaida-jaaisa/Microprocessor_Lab · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

CODE SEGMENT
ASSUME CS :CODE , DS :CODE ,ES :CODE ,SS :CODE


PPIC_C EQU 1EH
PPIC EQU 1CH
PPIB EQU 1AH
PPIA EQU 18H
 KEY EQU 01H
ORG 1000H

MOV AL , 80H
OUT PPIC_C , AL
;
 L2:
MOV AL , 01H
OUT PPIC , AL
MOV BL , AL  ; BL STORE VALUE OF PPIC
MOV AL , 0FFH   ;
OUT PPIA , AL

;
MOV AL , 0FEH    ; initial value
OUT PPIB , AL
CALL TIMER

 L1:
       STC
       ;;;;  NOW AL = PPIB , BL = PPIC
       ROL AL, 1
       ROL BL, 1
       ; point dot
       OUT PPIB, AL
       MOV DL , AL
       MOV AL, BL
       OUT PPIC, AL
       MOV AL , DL
       CALL TIMER
       JNC L1
       JMP L2

      INT 3
     ;

TIMER :
       MOV CX , 0FFFFH
 TIMER1:     NOP
       NOP
       NOP
       NOP
       LOOP TIMER1
       RET

       CODE ENDS
       END