What will be content of Z flag and P flag if result is all 0 after any arithmetic instruction?
These set of instructions will reset the sign flag to 0 as 40 – 30 is a positive number. Zero Flag (Z) – After any arithmetical or logical operation if the result is 0 (00)H, the zero flag becomes set i.e. 1, otherwise it becomes reset i.e. 0.
Which of the following flag will set when Carry will transfer from lower nibble to higher nibble?
3) The auxiliary carry flag(AC):- This flag is set whenever there has been a carry out of the lower nibble into the higher nibble or a borrow from higher nibble into the lower nibble of an 8 bit quantity, else AC flag is reset. This flag is used by decimal arithmetic instructions.
What is a flag What is the function of the accumulator?
This flag is used for BCD operations and it is not available for the programmer. P-Parity flag – Parity is defined by the number of ones present in the accumulator. After arithmetic or logical operation, if the result has an even number of ones, i.e.even parity, the flag is set. If the parity is odd, the flag is reset.
Which instruction execution does not affect carry flag?
INX B is a instruction which increment the content of the register pair BC by 1 and it does not affect any of the flags.
Which flag is not affected by instruction DCR B?
DCR perhaps does not affect CY. It must not be affecting AC flag also. ALU of 8085 have five flip flops whose states (set/reset) are determined by the result data of other registers and accumulator. They are called as Zero, Carry, Sign, Parity and Auxiliary-Carry flags.
What are the flags in 8086 give examples?
8086 has 16-bit flag register, and there are 9 valid flag bits….Status Flags.
| Flag Bit | Function |
|---|---|
| P | This is even parity flag. When result has even number of 1, it will be set to 1, otherwise 0 for odd number of 1s |
| CY | This is carry bit. If some operations are generating carry after the operation this flag is set to 1 |
What is the use of maximum mode in 8086?
In this we can connect more processors to 8086 (8087/8089). 8086 max mode is basically for implementation of allocation of global resources and passing bus control to other coprocessor(i.e. second processor in the system), because two processors can not access system bus at same instant.