What do you mean by status register?
A status register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor. The status register is a hardware register that contains information about the state of the processor.
What is execution program status register?
1.5. 2 Status register The bits are set according to the most recently executed ALU instruction that includes the special “s” suffix. In other words, an instruction whose condition code is evaluated to false will not change the state of the processor, such as writing a result register to changing the PC.
What is the status register in AVR?
The Status Register in AVR The Status Register (SREG) contains information about the result of the most recently executed arithmetic instruction. This information can be used for altering program flow in order to perform conditional operations. SREG is updated after any of ALU operations by hardware.
What is the purpose of using status register?
Status registers are used to test for various conditions in an operation, such as ‘is the result negative’, ‘is the result zero’, and so on.
How many registers are there in the 8086?
The 8086 has a total of fourteen 16-bit registers including a 16 bit register called the status register, with 9 of bits implemented for status and control flags. Most of the registers contain data/instruction offsets within 64 KB memory segment. There are four different 64 KB segments for instructions, stack, data and extra data.
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.
When to set a Z bit in the status register?
For example, a Z bit may be set if the result of the operation is zero and cleared if it is nonzero. Other classes of instructions may also modify the flags to indicate status.
Which is not accessible by user in 8085?
Note – This is the only flag register in 8085 which is not accessible by user. Parity Flag: It occupies the second bit of the flag register. This flag tests for number of 1’s in the accumulator.
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