微机实验报告六

许志斌级电气3班31实验六8255并行接口应用实验实验目的学习并掌握8255A的工作方式及其应用。掌握8255A典型应用电路接法。PC一台，TD-PITE微机/单片机教学实验装置一套。实验设备并行接口表2-6-1实验系统中8255A对应得端口地址表信号线A口B口C口控制寄存器IOY00600H0602H0604H0606HIOY10640H0642H0644H0646HIOY20680H0682H0684H0686HIOY306C0H06C2H06C4H06C6H接口实验的输入输出设备实验内容及环节题目规定：D0~~D7A0A1WRRDCPA0PA1PA2PA3PA4PA5PA6PA7修改图2-6-2实验电路，段数码管的输入A、B、C、D、E、F、G、DP分别接到8255A的PA7、PA6、PA5、PA4、PA3、PA2、PA1、PA0、上，CS接到IOY3。编程使七段数码管循环显示“F~A”“9~0”折十六个数。XD0~~XD7XA1XA2IOW#IOR#IOY3DPGFEDCBA2-6-18255A驱动显示实验接线图按图2-6-1连接实验线路图编写实验程序，经编译、链接无误后装入系统运行程序，观察七段数码管的显示。STACK SEGMENT STACKDW32DUP(?)STACK ENDSDATA SEGMENTVA1 DBFDH,61H,DBH,F3H,67H,B7H,BFH,E1H,FFH,F7H,EEH,FEH,9CH,FAH,9EH,8EHDATA ENDSCODE SEGMENTASSUMECS:CODE,DS:DATA,SS:STACKSTART: MOV AX,DATAMOV DS,AXMOV DX,06C6HMOV AL,80HOUT DX,ALA1: LEA SI,[VA1+15]MOV CX,10HA2: MOV DX,06C0HMOV AL,[SI]OUT DX,ALCALL DALLYDEC SILOOP A2JMP A1DALLY: PUSH CXMOV CX,0050HA3: MOV AX,0FFFHA4: DEC AXJNZ A4LOOP A3POP CXRETCODE ENDSEND START实验现象：数码管从“F~A”“9~0”依次显示。题目规定：按图2-6-1接线。编程：当拨动PA0对应得开关K0时，发光二极管全亮；K0拨回原位全灭。当拨动PA7对应得开关K7，两个发光二极管同时从D7到D0循环亮灯，K7拨回原位全灭。XD0~~XD7XA1XA2IOW#IOR#IOY0D0~~D7A0A1WRRDCSPB0~~PB7PA0~~PA7K0~~K7D0~~D7图2-6-28255A基本输入输出实验接线图实验环节：实验接线图如图2-6-2所示，按图连接实验线路图。编写实验程序，经编译、连接无误后装入系统。运行程序，改动拨动开关K0和K7，同时观察LED显示，验证程序功效。STACK SEGMENTDW32DUP(?)STACK ENDSCODE SEGMENTASSUMECS:CODE,SS:STACKSTART: MOV DX,0606HMOV AL,82HOUT DX,ALA1: MOV DX,0602HIN AL,DXTEST AL,01HJNZ A2JZ A3A2: MOV AL,0FFHMOV DX,0600HOUT DX,ALJMP A1A3: MOV AH,00HPUSH AXMOV AL,00HMOV DX,0600HOUT DX,ALPOP AXTEST AL,80HJNZ B1JMP A1B1: MOV BL,0C0HB2: MOV DX,0600HMOV AL,BLOUT DX,ALMOV DX,0602HIN AL,DXTEST AL,80HJZ A3MOV AL,BLROR AL,1ROR AL,1MOV BL,ALCALL DELAYJMP B2DELAY: PUSH CXPUSH AXMOV CX,0060HD1: MOV AX,0FFFHD2: DEC AX` JNZ D2LOOP D1POP AXPOP CXRETCODE ENDSENDSTAR