Find the C Z and H flags for each of the followinga LDI R20

Find the C, Z, and H flags for each of the following:(a) LDI R20, 0 times 3F LDI R21, 0 times 45 LDI R21, 0 times 58 (b) LDI R20, 0 times 99 LDI R21, 0 times 58 ADD R20, R21 (c) LDI R20, 0 times FF CLP R21 SEC ADD R20, R21 (d) LDI R20, C times FF LDI R21, 0 times 1 ADD R20, R21

Solution

1 Ans)

a) 0x3F-------0x0011 1111

0x45-------0x0100 0101

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0x1000 0100 H=1 C=0 Z=0

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b) 0x99-------0x1001 1001

0x58-------0x0101 1000

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0x1111 0001 H=1 C=0 Z=0

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c) 0xFF-------0x1111 1111

0x00-------0x0000 0000

carry-------------- 1

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0x0000 0000 H=1 C=1 Z=1

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(d) 0xFF-------0x1111 1111

0x01-------0x0000 0001

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0x0000 0000 H=1 C=1 Z=1