Parul Polytechnic Institute Subject Code : 3341101 Name Of Subject : Microprocessor and assembly language programming Name of Unit : Introduction to Microprossor.

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Microprocessors and Interfacing

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Parul Polytechnic Institute Subject Code : Name Of Subject : Microprocessor and assembly language programming Name of Unit : Introduction to Microprossor Topic : Pin function of 8085 Name of Faculty : H.M.Avaiya & Bhargav Halari

Flag Register

The Flags register There is also a flag register whose bits are affected by the arithmetic & logic operations. S-sign flag The sign flag is set if bit D7 of the accumulator is set after an arithmetic or logic operation. Z-zero flag Set if the result of the ALU operation is 0. Otherwise is reset. This flag is affected by operations on the accumulator as well as other registers. (DCR B). AC-Auxiliary Carry This flag is set when a carry is generated from bit D3 and passed to D4. This flag is used only internally for BCD operations.

P-Parity flag After an ALU operation, if the result has an even # of 1s, the p-flag is set. Otherwise it is cleared. So, the flag can be used to indicate even parity. CY-carry flag This flag is set when a carry is generated from bit D7 after an unsigned operation. OV-Overflow flag This flag is set when an overflow occurs after a signed operation.