1. Ch 4 – TK hệ VXL
Các thí dụ minh họa

2. LED Blinking
XTAL2
18
XTAL1
19
ALE
30
EA
31
PSEN
29
RST
9
P0.0/AD0
39
P0.1/AD1
38
P0.2/AD2
37
P0.3/AD3
36
P0.4/AD4
35
P0.5/AD5
34
P0.6/AD6
33
P0.7/AD7
32
P2.7/A15
28
P2.0/A8
21
P2.1/A9
22
P2.2/A10
23
P2.3/A11
24
P2.4/A12
25
P2.5/A13
26
P2.6/A14
27
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.7/RD
17
P3.6/WR
16
P3.5/T1
15
U1
80C51
B1 S1
R01
10k
R00
10k
R30
330R
R31
330R
DB1 DS1
X1
16MHzCX1
33p
CX2
33p
CRST
10n
RRST
10k
B2
R32
330R
DB2
D1
LED-GREEN
D2
LED-GREEN
D3
LED-GREEN
D4
LED-GREEN
D5
LED-GREEN
D6
LED-GREEN
D7
LED-GREEN
R1
330R
R2
330R
R3
330R
R4
330R
R5
330R
R6
330R
R7
330R
R8
330R
D8
LED-GREEN

3. Blink01.asm (1/2)
xtal equ 12 ; Crystal frequency in MHz
Patternequ 0FEh
org 0
mov P0,#00000011b ; Dat cau hinh P0.1 va P0.0 la Input
mov P3,#10000000b ; Dat cau hinh P3.7 la Input
mov P1,#Pattern
back:
; copy port0 switch B1,S1 states to acc
mov a,P0
anl a,#00000011b ; P0.1 and P0.0 are selected
orl a,#10000000b ; prepare P3.7 for input
; Sao chep bit P3.7 vao bit P3.2
mov C, p3.7
mov acc.2, C
mov P3,a

4. Blink01.asm (2/2)
mov A, P1
jb P0.1, RoR
; Xoay trai P1
RL A
sjmp Next
RoR:
; Xoay phai P1
RR A
Next: mov P1, A
; delay for 25ms delay
mov A,#250
acall dly100u
sjmp back
dly100u:
; delay loop takes
;
mov r1,A
dlylp1: mov r0,#(xtal*62/10)
dlylp2: djnz r0,dlylp2
djnz r1,dlylp1
ret
end

5. Boole_Up BCD counter_7seg LED
XTAL2
18
XTAL1
19
ALE
30
EA
31
PSEN
29
RST
9
P0.0/AD0
39
P0.1/AD1
38
P0.2/AD2
37
P0.3/AD3
36
P0.4/AD4
35
P0.5/AD5
34
P0.6/AD6
33
P0.7/AD7
32
P2.7/A15
28
P2.0/A8
21
P2.1/A9
22
P2.2/A10
23
P2.3/A11
24
P2.4/A12
25
P2.5/A13
26
P2.6/A14
27
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.7/RD
17
P3.6/WR
16
P3.5/T1
15
U1
80C51
X1
16MHzCX1
33p
CX2
33p
CRST
10n
RRST
10k
R1
270R
R2
270R
R3
270R
R4
270R
R5
270R
R6
270R
R7
270R

6. ;TD: boole04.asm
; Minh hoa cac lenh nhay theo tri bien Boole: JC, JNC, JB, JNB, JBC
; Mo phong mach dem 10: ngo ra nhi phan o 4 bit thap P2, duoc noi voi mach hien
thi so
; xung nhip CK (kich canh xuong) duoc noi chan P3.7
CK EQU P3.7
MOV P3,#80H ; Dat cau hinh P3.7 INPUT
MOV R0,#0 ; So dem ban dau la 0
MOV P0,#0C0H; Dau tien so dem la 0
LOOP:
JNB CK,$ ; Doi CK o muc 1
JB CK,$ ; Doi CK o muc 0 ==> phat hien duoc canh xuong
INC R0
CJNE R0,#10,NEXT
MOV R0,#0
NEXT:
MOV A,R0
ACALL BCD2LED
SJMP LOOP
BCD2LED:
MOV DPTR,#LED_DATA
MOVC A,@A+DPTR
MOV P0,A
RET
LED_DATA:
DB 0C0H, 0F9H, 0A4H, 0B0H, 99H, 92H, 82H, 0F8H, 80H, 90H
RET

7. Boole_Up BCD counter_7seg LED
Using Timer 0
XTAL2
18
XTAL1
19
ALE
30
EA
31
PSEN
29
RST
9
P0.0/AD0
39
P0.1/AD1
38
P0.2/AD2
37
P0.3/AD3
36
P0.4/AD4
35
P0.5/AD5
34
P0.6/AD6
33
P0.7/AD7
32
P2.7/A15
28
P2.0/A8
21
P2.1/A9
22
P2.2/A10
23
P2.3/A11
24
P2.4/A12
25
P2.5/A13
26
P2.6/A14
27
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.7/RD
17
P3.6/WR
16
P3.5/T1
15
U1
80C51
X1
12MHzCX1
33p
CX2
33p
CRST
10n
RRST
10k
R1
270R
R2
270R
R3
270R
R4
270R
R5
270R
R6
270R
R7
270R

8. ;TD: counter01.asm
; Minh hoa su dung chuc nang counter cua 8051
; Su dung T0 che do 2 lam counter voi CLK la chan P3.4 (T0)
; counter nay co modulo 10, nghia là dem het 9 thi tran
COUNT EQU -10
SETB P3.4 ; dat cau hinh input cho P3.4
MOV TMOD,#6 ; Timer 0: counter mode 2
MOV TH0, #COUNT
MOV TL0, #COUNT
SETB TR0
LOOP:
MOV A,TL0
ADD A,#-COUNT
CALL BCD2LED
MOV P0,A
SJMP LOOP
BCD2LED:
MOV DPTR,#LED_DATA
MOVC A,@A+DPTR
MOV P0,A
RET
LED_DATA:
DB 0C0H, 0F9H, 0A4H, 0B0H, 99H, 92H, 82H, 0F8H, 80H, 90H
RET
END