The DPTR is _____ as 16-bit register a 20-bit register an 8-bit register a 12-bi

Question

The DPTR is _____ as 16-bit register a 20-bit register an 8-bit register a 12-bit register What is the largest value that can be contained m register R7? 0FH FFH 0FFFH FFFFH What are the values of the auxiliary carry flag (AC) and the carry flag (CY) after the following program is run? MOV A. #5CH ADDA. #2AH AC = 0. CY = 0 AC = 0. CY = 1 AC = 1.CY = 0 AC = 1. CY = 1 What are the values of the carry flag (CY) and the overflow flag (OV) after the following program is run? MOV A # -120 A = 1000 1000 MOVR4 #-10. R4 = 1111 0110 ADDA R4 CY = 0. OV = 0 CY = 0. OV = 1 CY = 1. OV = 0 CY = 1. OV = 1

Explanation / Answer

1- DPTR- Data pointer register it is a 16 bit(2 byte register)

2- The register R is 1 Byte register and we can strore maximum FFh in it .

3-5C in binary is 0101 1100 and

2A is 0010 1010 adding them

we get 10000110

so for this cy-0 and ac-1

4- A- 1000 1000

r4-1111 0110

A+r4

1000 1000

+ 1111 0110

= 1 0111 1110

So for this

cy-1
ov-1

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