Which register shows the status of CPU?
Which register shows the status of CPU?
The status register is a hardware register that contains information about the state of the processor. Individual bits are implicitly or explicitly read and/or written by the machine code instructions executing on the processor.
What are the different flag register status?
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.
How many flags are in the status register?
Computer Architecture The flag register holds a collection of 16 different conditions. Table 14.1 outlines the most used flags. Contains the carry from the most significant bit (left hand bit) following a shift, rotate or arithmetic operation.
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.
Which register contains the 8086 flag?
8086 has 16-bit flag register, and there are 9 valid flag bits. The format of flag register is like below….Status Flags.
| Flag Bit | Function |
|---|---|
| Z | If the total register is zero, then only the Z flag is set |
How do flag registers show the status information?
Which register is referred as flag register?
The FLAGS register is the status register that contains the current state of a CPU. The adjust flag used to be called auxiliary carry bit in 8080 and half-carry bit in the Zilog Z80 architecture. In i386 architecture the register is 16 bits wide.
What is the flag register?
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). If the MSB is 0, it indicates the number is positive and the sign flag becomes reset i.e. 0.
Which flag of status register are most likely to get affected?
Z flags
The answer to your query is the Z flags. It is the Z flags of status register are most likely to get affected by the single cycle increment and decrement instructions.
What is the format of the flag register in 8086?
The format of flag register is like below. We can divide the flag bits into two sections. The Status Flags, and the Control Flags. In 8086 there are 6 different flags which are set or reset after 8-bit or 16-bit operations. These flags and their functions are listed below.
What are the names of the status registers?
The two status registers have 16 bits and are called the instruction pointer (IP) and the flag register (F): IP, which is the instruction pointer. The IP register contains the address of the next instruction of the program. Flag register. The flag register holds a collection of 16 different conditions.
How many flags are there in the 8085 microprocessor?
In 8085 microprocessor, flag register consists of 8 bits and only 5 of them are useful. The 5 flags are: Sign Flag (S) – After any operation if the MSB (B (7)) of the result is 1, it indicates the number is negative and the sign flag becomes set, i.e. 1. If the MSB is 0, it indicates the number is positive and the sign flag becomes reset i.e. 0.
Is the flag register a special purpose register?
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). (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.