51指令系统中,执行下列程序后,程序计数器PC的内容为______ ORG 0000H MOV DPTR, #1000 MOV A, #00H MOV 20H, A LJMP 1500H END
举一反三
- MCS-51指令系统中,执行下列程序后,ORG 000H MOV DPDR,#1000 MOV A, #00H MOV 20H,A LJMP 1500 END 程序计数器PC的内容为 A: 100 B: 1000 C: 1500 D: 0
- MCS—51指令系统中,执行下列程序后,堆栈指针SP的内容为_____。 MOV SP,#30H MOV A,20H LCALL 1000 MOV 20H,A SJMP $
- 根据下列程序段运行情况,将运行结果和指令分别补充完整。 (1)( );(A)=10H ( );(B)=10H ( );(A)=20H MOV 23H,A;(23H)=20H ( );(A)=21H MOV 24H,A;(24H)=21H INC A ;(A)=22H ( );(25H)= 22H (2)MOV A,#50H;(A)=( )H MOV R0,A;(R0)=( )H MOV @R0,#30H;(50H)=( )H ADD A,@R0;(A)=( )H MOVX @R0,A;(50H)=( )H
- ORG 0 LJMP START ORG 30H START:MOV SP,#50HMOV R2,#10H MOV DPTR,#3000H CLR ALOOP: MOVX @DPTR,A INC DPTR DJNZ R2,LOOP INC DPH INC DPH MOV 20H,#36H SETB 00H MOV A,20H MOVX @DPTR,A INC A INC A PUSH ACC XCH A,R2 POP DPH ADD A,#55H PUSH ACC END(A)= (R2)= (20H)= (DPTR)= (SP)=
- 执行下列指令组后,程序计数器PC的内容为()H。