TAI LIEU THUC HANH VXL

Trường ĐH Bà Rịa-Vũng Tàu
Khoa Điện-Điện tử
;chuong trinh den giao thong co hien thi thoi gian dem nguoc.
;ket noi port 1 voi dãy led mo phong den giao thong.
;ket noi port 0 voi ngo vao du lieu led 7 đoan, port 2 với ngo vao chon led.
;===================================================================
biendem equ 20h ;dinh nghia cac bien
bientrangthai equ 21h ;trang thai hien tai cua he thong
thoigian1 equ 22h ;thoi gian hien thi o huong 1
thoigian2 equ 23h ;thoi gian hien thi o huong 2
xanh1 equ 15
vang1 equ 5
xanh2 equ 10
vang2 equ 3
org 0000h
sjmp start ;nhay den chuong trinh chinh
org 000bh ;dia chi vecto ngat timer0
ljmp dengiaothong ;nhay den chuong trinh phuc vu ngat timer0
;------------------------------------------------- khoi tao timer 0 dem thoi gian
start: mov tmod,#01h ;khoi tao timer0 mode1
mov th0,#high(-50000)
mov tl0,#low(-50000)
setb et0 ;cho phep ngat timer0
setb ea ;cho phep ngat toan bo
setb tr0 ;chay timer0
;-------------------------------------------------- khoi tao cac gia tri ban dau
mov biendem,#0
mov bientrangthai,#0
mov thoigian1,#1
;-------------------------------------------- chuong trinh chinh thuc hien quet hien thi
begin: mov r0,#45h ;lay dia chi cuoi cua ram hien thi
mov r2,#11111110b ;chon led dau tien
rep: mov p2,r2
mov a,@r0
mov p0,a
lcall delay
mov p0,#0ffh
dec r0
mov a,r2
rl a
mov r2,a
jb acc.6,rep
sjmp begin
;-------------------------------------------- chuong trinh ngat dieu khien den giao thong
dengiaothong:
push 00h
push acc
mov tl0,#low(-50000)
mov th0,#high(-50000)
inc biendem ;tang bien dem
mov a,biendem
cjne a,#20,finish
mov biendem,#0
dec
thoigian1
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