The flag register is a special register. It is an 8-bit, 16-bit, or 32-bit register and does not make any sense as a unit. Instead, each bit has the same meaning. The flag register bits operate independently; their combined value has no meaning.
The bits of the Intel flag register is organized as follows:
The answer can be 17 bits long when two 16-bit numbers are added or 9 bits long when two 8-bit numbers are added. This extra bit that does not fit into the destination register is placed in the carry flag, which can be used and tested.
A parity flag is a check bit that is added to a block of data for error detection purposes. It is used to verify the integrity of the data. The value of the parity bit is assigned as either 0 or 1. Making the number of 1s in the message block even or odd depends on the type of parity.
Base 16 numbers are called hexadecimal numbers and can be represented by 4 bits. A collection of 4 bits is called a nibble. This flag is set if a carrier is moved from one nibble to another during addition or subtraction. The carry flag is the carry from the entire addition, and the extra carry is the carry from the first bit to the second.
The zero flag is set if the last math or logic instruction returned zero at its destination.
A signed number is displayed on computers as the complement of two. In this representation, the most significant bit (MSB) is 1 for negative numbers and zero for positive numbers. The sign bit of the target of the last math or logic operation is copied to the sign flag.
A trap flag is used for on-chip debugging. Setting the trap flag puts the microprocessor into one-step debug mode. The microprocessor executes an instruction in a single step and switches to the single-step ISR.
It tells the processor whether it can be interrupted externally. Sometimes programmers do not want a particular task to be interrupted, so the interrupt flag can be set to zero. Interrupts can be disabled or enabled by special instructions to set this bit to 0 or 1, respectively.
It is particularly relevant to string statements. The direction flag specifies whether the current operation should be performed from the bottom to the top (D=0) or from the top to the bottom of the block (D=1).
Set the overflow flag during token computation, such as addition or subtraction, when the target sign changes unexpectedly. The actual process sets the overflow flag when the transfer to the MSB is different from the transfer from the MSB.
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