单片机:指定内部RAM中某块的起始地址和长度,要求能将其内容清零怎么写代...答:CLRRAM:MOV R0, #start MOV R7, #length CLR A loop:MOV @R0, A INC R0 DJNZ R7, loop RETCLRXRAM:MOV R0, #xstart MOV R7, #xlength CLR A xloop:MOVX @R0, A INC R0 DJNZ R7, xloop RETSETXRAM:MOV R0, #xstart MOV R7, #xlength MOV A, #value xloop2:MOVX @R0, A...
MCS-51单片机试题答:1. 设内部RAM的30H单元的内容为40H,即(30H)=40H,还知(40H)=10H,(10H)=00H,端口P1=CAH,问执行以下指令后,各有关寄存器,存储单元和端口的内容是什么?(即R0,R1,A,B,P1,40H,30H及10H单元)MOV R0, #30H (R0)=30HMOV A, @R0 (A) =((R0))=(30H)=40HMOV R1, A (R1)=40HMOV B, @R1 (B)...