What is status register in assembly language?
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.
What is status register in microprocessor?
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 classifications of 8086 registers?
The registers inside the 8086 are all 16 bits. They are split up into four categories: General Purpose, Index, Status & Control, and Segment. The four general purpose registers are the AX, BX, CX, and DX registers.
How many status flag does 8086 have?
6 flag registers
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.
How many types of status registers are there?
The PSRs are subdivided into three status registers: Application Program Status register (APSR) Interrupt Program Status register (IPSR) Execution Program Status register (EPSR)
What is the size of status register?
The Status Register has 16 bits, with each bit having a flag.
How many registers are in 8086?
The 8086 has eight more or less general 16-bit registers (including the stack pointer but excluding the instruction pointer, flag register and segment registers). Four of them, AX, BX, CX, DX, can also be accessed as twice as many 8-bit registers (see figure) while the other four, SI, DI, BP, SP, are 16-bit only.
What are types of registers?
Types of Register in Computer Organization
- AC ( accumulator )
- DR ( Data registers )
- AR ( Address registers )
- PC ( Program counter )
- MDR ( Memory data registers )
- IR ( index registers )
- MBR ( Memory buffer registers )
What are the different flag available in status register of 8086?
8086 has 16-bit flag register, and there are 9 valid flag bits….Status Flags.
| Flag Bit | Function |
|---|---|
| CY | This is carry bit. If some operations are generating carry after the operation this flag is set to 1 |
| O | The overflow flag is set to 1 when the result of a signed operation is too large to fit. |
How many registers are there in 8086 microprocessor?
eight
The 8086 has eight more or less general 16-bit registers (including the stack pointer but excluding the instruction pointer, flag register and segment registers). Four of them, AX, BX, CX, DX, can also be accessed as twice as many 8-bit registers (see figure) while the other four, SI, DI, BP, SP, are 16-bit only.
What are the 4 bit used in status register?
The most significant four bits of the xPSR are the condition code bits, Negative, Zero, Carry, and oVerflow. These will be set and cleared depending on the results of a data processing instruction. The result of Thumb-2 data processing instructions can set or clear these flags.
How many bits is status register?
The Program Status Register is 32-bit and can be subdivided into: Application PSR—contains various “ALU flags” which are required for conditional branches and instruction operations that need special flags (e.g., add with carry flag). Execution PSR—contains execution state information.