单片机原理及应用B答案

《单片机原理及应用》模拟卷21、分析程序的执行结果，将结果填写到空格中。ORGMOVMOV0000H30H,#50HR0,#30HMOVA,@R0;(A=50H)MOVA,#79HMOVB,#20H;(A=79HB=20H)DIVAB;(A=03HB=19H)PUSHBMOVB,#0AHMULAB;(A=1EHB=00H)POPBADDA,B;(A=37HB=19H)MOV30H,A;(30H单元的内容=37H)LOOP:AJMPLOOP2MCS51RAM50H～55H1216ASCII2800HRAM中。解：ORG 0000HLJMP MAINMAIN：MOV MOV MOV R0，#06TOP：MOV A，@DPTRPUSH ACCANL A，#0FH ；取出四位二进制数PUSH ACCCLR SUBB A，#0AHPOP ACC ；弹回A中JC LOOP ；该数〈10去ADDA，#07H07HLOOP：ADDA，#30H；加30HMOVR2，APOPACCANL #0F0H ；取出下一个四位二进制数PUSH ACCCLR SUBB A，#0AHPOP ACC ；弹回A中JC LOOP ；该数〈10去SWAPAORLA，R2MOVX@R1，AINCDPTRINCR1DECSWAPAORLA，R2MOVX@R1，AINCDPTRINCR1DECR0JNZTOP；将结果存到RAM中；判断转换完没有，未转换完则转TOP38031T0定时/P1.050ms100个方波后停止输出。#include<reg51.h>#defineucharunsignedcharuchara;voidmain(void){TMOD=0X01;TL0=0XB0;TH0=0X3C;EA=1;ET0=1;TR0=1;while(1){if(a==100){EA=0;TR0=0;}}}voidtimer0(void)interrupt1{TL0=0XB0;TH0=0X3C;cplp1.0;a++;}41RAM30H～37HASCII编制甲机发送和乙机接收的程序（加奇校验。A机发送程序设计ST:MOVTMOD,#20HMOVTL1,#0E8HMOVTH1,#0E8HSETBTR1MOVSCON,#50HMOVR0,#30HMOVR1,#08HLOOP:MOVA,@R0CALLFSINCR0DJNZR1,LOOPRETFS:MOVCPLCMOVMOVSBUFAWAIT:JNBTI,WAITCLRTIRETB机的接受程序设计接受串口发来的程序，假设存放在30H—37H中ST:MOVTMOD,#20HMOVTL1,#0E8HMOVTH1,#0E8HSETBTR1MOVSCON,#50HMOVR0,#30HMOVR1,#08HLOOP:CALLJSJNCERRORMOV@R0，AINCR0DJNZR1,LOOPRET ERROR:………;RETJS:JNBRIJSCLRRIMOVA,MOVPCANLA,#7FHRET580318A/D（ADC0809）20ms030HRAM（提示：需要用定时器和外部中断。MAIN：MOVTMOD，#01H//0初始化MOVTL0，#10HMOVTH0，#27HMOVR0，#30HSETBTR0SETBET0SETBEX0SETBEASJMP$0中断服务子程序：ORG000BHMOVDPTR，#7EF8H//ADCIN0通//AD转换CLRTR0MOVMOVSETBTR0RETI外部中断（INT0）子程序：ORG0003HMOVXA，@DPTRMOV@R0，AINCR0RETIKEY1：ACALLKS1；调用判断有无键按下子程序JNZLK1AJMPKEY1LK1：ACALLTM12s12ms延时子程序ACALLKS1JNZLK2AJMPKEY1LK2MOVR2，#0FEHMOVR4，#00HR4LK4：MOVDPTR，#0FD01H；列扫描字送8155PA口MOVMOVXINCDPTR8155PC口INCDPTRMOVXA，@DPTRJBACC.0，LONE；第0行无键按下，查第1行MOVA，#00H；有键按下，该行首键号送AAJMPLKPLONE：JBACC.1，NEXTMOVA，#08HLKP：ADDA，R4；键号=行键号+列号PUSHACCLK3：ACALLKS1；等待键释放JNZLK3POPACCRETNEXT：INCR4MOV8列是否全扫描完JNBRLA；求得下一列的扫描字MOVR2，AAJMPLK4KND：AJMPKEY1KS1MOVDPTR，#0FD01HPA口MOVA，#00H；全扫描字MOVX@DPTR，AINCDPTRPB口INCDPTRMOVXA，@DPTRCPLANLA,#03H;屏蔽高6位RETTM12msMOVR7，#18H12ms子程序TM：MOVR6，#0FFHTM6：DJNZR6，TM6DJNZR7，TMRETLED显示子程序：MOVR0，#30HMOVR3，#02H00000010BLDMOVPA口MOVDPTR，#0FD01HMOVX@DPTR，AINCDPTRB口地址MOVA，@R0；加偏移值，得到相应的显示代码ADDA，#0DHMOVCA，@A+PCMOVX@DPTR，AACALLLD11ms的子程序INCR0MOVA，R3；如果6个显示器都扫描一遍，返回主程序ADDA，#01H；使最高位是否为1判断扫描是完毕JBACC。7，LD1RLA；修改扫描行MOVR3，AAJMP