What is status register in ARM?
The Linux/ARM embedded platform ARM v6/v7 maintains a status register called the CPSR (current program status register) that holds four status bits, negative (N), zero (Z), carry (C), and overflow (O). The bits are set according to the most recently executed ALU instruction that includes the special “s” suffix.
What is the program status register?
The Application Program Status Register (APSR) holds the program status flags that are accessible in any processor mode. It holds copies of the N, Z, C, and V condition flags . The processor uses them to determine whether or not to execute conditional instructions.
How many flags are there in flag register of ARM processor program status register?
6 flag registers
(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.
How many status registers are available in arm7?
In ARM state, 16 general registers and one or two status registers are accessible at any one time. In privileged modes, mode-specific banked registers become available.
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.
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What are the status registers in an ARM processor?
Current Program Status Registers in Traditional ARM Processors. 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. The two status registers have 16 bits and are called the instruction pointer (IP) and the flag register (F):
What does the carry in the status register mean?
Contains the carry from the most significant bit (left hand bit) following a shift, rotate or arithmetic operation. Contains the sign of an arithmetic operation (0 for positive, 1 for negative). Contains results of last arithmetic or compare result (0 for non-zero, 1 for zero).