1. 将片外8000H-80FFH单元写入数据AB ····················································· 1 2. 将片内RAM20H单元中数据在数码管上显示出来······································ 1 3. 将片内ARM30H-40H单元清零 ······· 2 4. 将六位数显示在数码管上 ················ 2 5. 8255并口芯片的应用：交通灯控制系统的设计 ············································ 3 6. 将交通灯点亮 ······························· 3 7. AD转换实验 ································ 4 8. DA转换实验 ································ 5 9. 定时器的应用 ······························· 5 10. 开关控制LED的亮灭及速度 ········· 6 11. 计数器实验 ································ 6 12. 串并转换实验 ····························· 7 13. 直流电机速度检测 ······················· 7 14. 8255PB外接8个开关，编程将开关状态显示在数码管上（串并转换动态扫描方式） ··············································· 8 15. P3.4接开关K，编程将开关拨动次数，通过串并转换的方式进行显示 ············· 9 16. 比较片内RAM30H、31H两个单元值的大小，将较大的数显示在数码管上 ·· 10 17. 单片机P1口接8个开关，编程将开关状态显示在数码管上（串并转换动态扫描方式） ·········································· 10 18. 将片内50H单元的值显示在数码管上11 19. 开关K1接P1.0，K2接P1.1，编程实现当按下K1时在数码管上显示50H单元的值，按下K2在数码管上显示51H单元的值 ············································· 12
1. 将片外8000H-80FFH单元写入数据AB
ORG 0000H ;程序从0000H开始执行
AJMP MAIN ;跳转到主程序
ORG 0030H ;以免覆盖中断地址 MAIN: MOV SP,#60H; 避免堆栈和工作寄存器区冲突 MOV DPTR,#8000H MOV R0,#0 LOOP:
MOV A,#0ABH MOVX @DPTR,A
INC DPTR
INC R0
CJNE R0,#0,LOOP ; 判断
AJMP $; 等待
END ;调试-视图-M存储器(输入地址
X:8000H)
2. 将片内RAM20H单元中数据在数码管上显示出来 ORG 0000H ;程序从0000H开始执行
AJMP MAIN ;跳转到主程序
ORG 0030H
;以免覆盖中断地
址 MAIN: MOV SP,#60H ;避免堆栈和工作寄存器区冲突 MOV DPTR,#0E100H ;指向命令口地址
MOV A,#03H
;PA、PB口输出
MOVX @DPTR,A ;所有并口
显示程序先进行8155初始化
MOV 20H,#34H MOV A,20H
ACALL CHAI
LOOP: MOV R0,#10H ;第一个显示数的地址送R0
MOV R1,#2 ;显示2个数 MOV R2,#1 ;从倒数第一个数码管开始显示
ACALL DISPLAY LJMP LOOP ;判断
CHAI:
MOV B,#10H DIV AB MOV 10H,B MOV 11H,A
RET DISPLAY: MOV A,@R0 MOV 0FH,#8 ACALL P164 ACALL PBIT ACALL DELAY MOV A,#0 MOVX @DPTR,A INC R0
DJNZ R1,DISPLAY
RET
P164: MOV DPTR,#TAB MOVC A,@A+DPTR P164_1: RRC A MOV R3,A MOV ACC.0,C ANL A,#0FDH MOV DPTR,#0E102H MOVX @DPTR,A ORL A,#0FEH MOVX @DPTR,A MOV A,R3 DJNZ 0FH,P164_1 MOV 0FH,#8
RET
PBIT: MOV DPTR,#0E101H MOV A,R2 MOVX @DPTR,A RL A MOV R2,A
RET DELAY: MOV R6,#4 DEL: MOV R7,#250 DJNZ R7,$ DJNZ R6,DEL
RET TAB: DB 0FCH,60H,0DAH,0F2H,66H,0B6H,0BEH,0E0H DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH
END
3. 将片内ARM30H-40H单元清零
ORG 0000H
;程序从0000H开始执
行 AJMP MAIN ;跳转到主程序
ORG 0030H
;以免覆盖中断地址
MAIN: MOV SP,#60H ;避免堆栈和工作寄存器区冲突 MOV R0,#30H MOV A,#0 LOOP:
MOV @R0,A INC R0
CJNE R0,#41H,LOOP ;判断
AJMP $ ;等待
END ;地址D:30H
4. 将六位数显示在数码管上 ORG 0000H ;程序从0000H开始执行
AJMP MAIN ;跳转到主程序
ORG 0030H
;以免覆盖中断地
址 MAIN: MOV SP,#60H ;避免堆栈和工作寄存器区冲突 MOV DPTR,#0E100H ;指向命令口地址
MOV A,#03H
;PA、PB口输出
MOVX @DPTR,A
;所有并口
显示程序先进行8155初始化 LOOP: MOV R0,#10H ;第一个显示数的
地址送R0 MOV 10H,#0H MOV 11H,#3H MOV 12H,#1H MOV 13H,#2H
MOV 14H,#1H MOV 15H,#1H MOV R1,#6 ;显示6个数 MOV R2,#1
;从倒数第一个数
码管开始显示
ACALL DISPLAY
LJMP LOOP DISPLAY: MOV A,@R0 MOV 0FH,#8 ACALL P164 ACALL PBIT ACALL DELAY MOV A,#0 MOVX @DPTR,A INC R0
DJNZ R1,DISPLAY
RET
P164: MOV DPTR,#TAB MOVC A,@A+DPTR P164_1: RRC A MOV R3,A
MOV ACC.0,C
ANL A,#0FDH MOV DPTR,#0E102H MOVX @DPTR,A ORL A,#0FEH MOVX @DPTR,A MOV A,R3 DJNZ 0FH,P164_1 MOV 0FH,#8
RET
PBIT: MOV DPTR,#0E101H MOV A,R2 MOVX @DPTR,A RL A MOV R2,A
RET DELAY: MOV R6,#4 DEL: MOV R7,#250 DJNZ R7,$ DJNZ R6,DEL
RET TAB: DB 0FCH,60H,0DAH,0F2H,66H,0B6H,0BEH,0E0H DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH
END
5. 8255并口芯片的应用：交通灯控制系统的设计 ORG 0000H AJMP START ORG 0030H
START:
MOV DPTR,#0AC03H
MOV A,#80H
MOVX @DPTR,A //8155初始化(所有并口显示中都要先8155初始化)
MOV R5,#0F0H ACALL DENG MOV R1,#20 ACALL DELAY MOV R0,#1 LOOP01:
MOV R5,#5AH ACALL DENG MOV R1,#100 ACALL DELAY
DJNZ R0,LOOP01
MOV R0,#3 // LED_2闪烁次数 LOOP02: MOV R5, #0FAH ACALL DENG MOV R1,#10 ACALL DELAY MOV R5,#50H ACALL DENG MOV R1,#10 ACALL DELAY DJNZ R0,LOOP02 MOV R5,#0A5H ACALL DENG MOV R1,#100 ACALL DELAY
MOV R0,#3 LOOP03: MOV R5, #0F5H ACALL DENG MOV R1,#10 ACALL DELAY MOV R5,#0A0H ACALL DENG MOV R1,#10 ACALL DELAY DJNZ R0,LOOP03
AJMP LOOP01
DENG:
MOV DPTR,#0AC00H //8155 PA口输出 MOV A,R5
MOVX @DPTR,A //8155 PA口送出显示参数
RET //100ms延时子程序 DELAY: MOV R7,#200 DEL: MOV R6,#229 DJNZ R6,$ DJNZ R7,DEL DJNZ R1,DELAY RET
END
6. 将交通灯点亮 ORG 0000H AJMP START
ORG 0030H
START:
MOV DPTR,#0AC03H MOV A,#80H MOVX @DPTR,A MOV DPTR,#0AC00H MOV A,#05AH MOVX @DPTR,A AJMP $
END
7. AD转换实验 ORG 0000 AJMP START ORG 000BH AJMP INT_0 ORG 0030H START:
MOV SP,#60H MOV TMOD,#01H MOV TH0,#4BH MOV TL0,#0FDH MOV R4,#2
SETB EA SETB ET0 SETB TR0
MOV DPTR,#0E100H MOV A,#3 MOVX @DPTR,A MOV 22H,#9 MOV 23H,#0 MOV 24H,#8 MOV 25H,#0 LOOP:
MOV R0,#20H MOV R1,#6 MOV R2,#1 ACALL DISPLAY SJMP LOOP INT_0:
MOV TH0,#4BH MOV TL0,#0FDH DJNZ R4,EXIT PUSH ACC PUSH DPH PUSH DPL
MOV DPTR,#0A000H MOVX A,@DPTR MOV B,#10H
DIV AB
MOV 21H,A MOV 20H,B MOVX @DPTR,A MOV R4,#2
POP DPL POP DPH
POP ACC EXIT:
RETI DISPLAY:
MOV A,@R0 MOV 0FH,#8 ACALL P164 ACALL PBIT ACALL DELAY MOV A,#0 MOVX @DPTR,A INC R0
DJNZ R1,DISPLAY
RET
P164: MOV DPTR,#TAB MOVC A,@A+DPTR P164_1: RRC A
MOV R3,A MOV ACC.0,C ANL A,#0FDH MOV DPTR,#0E102H MOVX @DPTR,A ORL A,#0FEH MOVX @DPTR,A MOV A,R3 DJNZ 0FH,P164_1 MOV 0FH,#8 RET
PBIT:
MOV DPTR,#0E101H MOV A,R2 MOVX @DPTR,A RL A MOV R2,A
RET DELAY: MOV R6,#4 DEL: MOV R7,#250
DJNZ R7,$ DJNZ R6,DEL
RET TAB:
DB
0FCH,60H,0DAH,0F2H,66H,0B6H,0BEH,0E0H DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH
END
8. DA转换实验 ORG 0000 SJMP START ORG 0030H START: MOV SP,#60H MOV A,#0
LOOP1:
MOV DPTR,#0B000H MOVX @DPTR,A ACALL XS ACALL DELAY INC A
CJNE A,#0FFH,LOOP1 LOOP2: MOV DPTR,#0B000H MOVX @DPTR,A ACALL XS ACALL DELAY DEC A
CJNE A,#0,LOOP2 SJMP LOOP1 XS: PUSH ACC
MOV DPTR,#TAB MOV B,#51 DIV AB MOV R1,A XCH A,B MOV B,#5
DIV AB
MOVC A,@A+DPTR MOV R4,#8 ACALL S164 MOV A,R1
MOVC A,@A+DPTR MOV R4,#8 ACALL S164 MOV A,#0 CLR C MOV R4,#16
ACALL S164 POP ACC RET S164: RRC A MOV P1.0,C CLR P1.1 SETB P1.1 DJNZ R4,S164 RET
DELAY: MOV R7,#200
DEl: MOV R6,#229 DJNZ R6,$ DJNZ R7,DEL
RET TAB: DB 0FCH,60H,0DAH,0F2H,66H,0B6H,0BEH,0E0H DB 0FEH,0F6H,0EEH,3EH,9CH,7AH,9EH,8EH
END
9. 定时器的应用 ORG 0000H AJMP START ORG 00BH AJMP INT_0 ORG 0030H START:
MOV TMOD,#01H MOV TH0,#4BH MOV TL0,#0FDH MOV R0,#20 MOV R1,#0 SETB ET0 SETB TR0 SETB EA AJMP $ INT_0:
MOV TH0,#4BH MOV TL0,#0FDH DJNZ R0,EXIT MOV R0,#20 MOV A,R1 MOV DPTR,#TAB MOVC A,@A+DPTR MOV P1,A INC R1
CJNE R1,#8,EXIT