题目内容

The contents of accumulator and CY are D6H and 0 respectively. After execution of instruction “RLC A”, the contents of A will be ( )

ACH
B. CAH
C. ADH
DAH

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The contents of DPTR is 20FFH. After execution of instruction “INC DPTR”, the contents of DPH will be ( )

A. 20H
B. 21H
C. 00H
D. FFH

Flag () is used to indicate error in signed arithmetic operations. ( )

AC
B. OV
CY
D. P

Flag () is used to indicate carry out in unsigned arithmetic operations. ( )

AC
B. OV
CY
D. P

The contents of accumulator and CY are BAH and 0 respectively. After execution of instruction “SUBB A, #64H”, the status of CY and OV flags will be ( )

A. (CY)=0, (OV)=0
B. (CY)=0, (OV)=1
C. (CY)=1, (OV)=0
D. (CY)=1, (OV)=1