What are the flag register of 8085?
The 8085 has an 8-bit flag register, but there are only five active flag bits. They are – S, Z, AC, P and CY. Flags are basically flip-flops which are used to show the status of some units of the 8085 after the completion of their respective operations.
What is flag register in microprocessor?
The FLAGS register is the status register that contains the current state of a CPU. The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.
What is flag register and its types?
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 is the function of carry flag?
The carry flag enables numbers larger than a single ALU width to be added/subtracted by carrying (adding) a binary digit from a partial addition/subtraction to the least significant bit position of a more significant word.
What are flags in microcontroller?
The Flag register is a Special Purpose Register which shows the status of the task. This is an 8-bit register but the only 5bit is used for the operation. The flag becomes set or reset after arithmetic and logical operation.
Which register contains the 8086 flag?
Discussion Forum
| Que. | Which register containing the 8086/8088 flag? |
|---|---|
| b. | Stack register |
| c. | Flag register |
| d. | Stand register |
| Answer:Status register |
Why are flags needed in microprocessors?
A microprocessor is an integrated circuit that can be programmed to process data and send messages and directions to other electronic systems. They are the main features of computer processing systems. Flags are an important component of microprocessors as they register the outcomes of calculations and actions.
What is carry flag example?
Carry Flag is a flag set when: a) two unsigned numbers were added and the result is larger than “capacity” of register where it is saved. Ex: we wanna add two 8 bit numbers and save result in 8 bit register. In your example: 255 + 9 = 264 which is more that 8 bit register can store.
What is meant by carry flag?
In computer processors the carry flag (usually indicated as the C flag) is a single bit in a system status register/flag register used to indicate when an arithmetic carry or borrow has been generated out of the most significant arithmetic logic unit (ALU) bit position.
Why are flags used in 8085?
Prerequisite – Registers of 8085 microprocessor The Flag register is a Special Purpose Register. Depending upon the value of result after any arithmetic and logical operation the flag bits become set (1) or reset (0).
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