In 8085 microprocessor, the flags register
How many flags are there in flag register in 8085?
In 8085 microprocessor, the flags register can have a total of eight flags . Thus a flag can be represented by 1 bit of information. But only five flags are implemented in 8085.
How many flags are there in flag register?
There are total 9 flags in 8086 and the flag register is divided into two types: (a) Status Flags – There are 6 flag registers in 8086 microprocessor which become set(1) or reset(0) depending upon condition after either 8-bit or 16-bit operation. These flags are conditional/status flags.
What are flags available in 8085?
- Carry flag (Cy),
- Auxiliary carry flag (AC),
- Sign flag (S),
- Parity flag (P), and.
- Zero flag (Z).
How many registers are there in 8085 microprocessor?
General-Purpose Registers: The 8085 microprocessor contains six 8-bit general purpose registers. They are: B, D, C, E, H and L register. To hold data of 16-bit a combination of two 8-bit registers can be employed. The combination of two 8-bit registers is called register pair.
What is difference between carry and auxiliary carry flag?
The auxiliary carry flag AF watches for a 4-bit (nibble) carry , while the common carry flag CF watches for a carry-out from the MSB of the operand size.
Which instruction does not affect any flag?
As there is no arithmetic or logical operation being performed, no flags are affected by data transfer instructions . Arithmetic instruction: Arithmetic Instructions are the instructions that perform basic arithmetic operations such as addition, subtraction, and a few more.
Who carried the four flags?
Tenzing , the object of this compositional moment, unfurls four flags that he has tied together by string and wrapped around the handle of his ice-axe. He holds his ice-axe high in the air, and the four flags flutter. A shutter is about to fall.
Which flag is not present in 8085 microprocessor?
Zero flag is present in 8085 but not in the 8051.
Which register contains 8086 flag?
| Flag Bit Function | Z If the total register is zero, then only the Z flag is set |
|---|
How many registers are in 8086?
The 8086 has eight more or less general 16 -bit registers (including the stack pointer but excluding the instruction pointer, flag register and segment registers). Four of them, AX, BX, CX, DX, can also be accessed as twice as many 8-bit registers (see figure) while the other four, SI, DI, BP, SP, are 16-bit only.
Which register of 8085 is 16-bit?
Stack Pointer : The stack pointer in the 8085 microprocessor is a 16-bit register that stores the address of the top of stack memory.
What are the types of registers?
| Register Symbol Function | Data register DR Holds memory operand | Address register AR Holds address for the memory | Accumulator AC Processor register | Instruction register IR Holds instruction code |
|---|
Which is the application of auxiliary flag?
Auxiliary Carry Flag (AF) is one of the six status flags in the 8086 microprocessor. This flag is used in BCD (Binary-coded Decimal) operations . The status of this flag is updated for every arithmetic or logical operation performed by ALU.
What is the function of auxiliary carry flag?
This flag is used in BCD (Binary-coded Decimal) operations . The status of this flag is updated for every arithmetic or logical operation performed by ALU. This flag is set to one if there is a CARRY from the lower nibble or BORROW for the lower nibble in binary representation. Else it is set to zero.
How is carry flag calculated?
The carry (borrow) flag is also set if the subtraction of two numbers requires a borrow into the most significant (leftmost) bits subtracted . 0000 – 0001 = 1111 (carry flag is turned on) Otherwise, the carry flag is turned off (zero). In unsigned arithmetic, watch the carry flag to detect errors.
