What is meant by control register and data register?

What is meant by control register and data register?

A control register is a processor register which changes or controls the general behavior of a CPU or other digital device. Common tasks performed by control registers include interrupt control, switching the addressing mode, paging control, and coprocessor control.

Which of the following is control and status register?

Control and Status Register (CSR) is a register in many central processing units that are used as storage devices for information about instructions received from machines.

Which part of control register is MSW?

Q. Which kind of low-order 16 bits control register is also regarded as ‘Machine Status Word’ (MSW) in order to make it compatible with i286?

What is the difference between status and control register?

CPU status register Let the software mask interrupts at the CPU level; all interrupts are masked, no matter what device generates them. Device control register Let the software mask interrupts per device; some device can be prevented from generating an interrupt some not.

What are the different types of registers?

Different Types of Registers

• MAR Register. The full form of MAR is the memory address register.
• MDR. The full form of MDR register is a memory data register.
• MBR. The full form of MBR is the memory buffer register.
• PC. The full form of PC is the program counter register.
• Accumulator.
• Index Register.
• Instruction Register.

What is Flag Register and its types?

The Flag register is a Special Purpose Register. 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.

What is flag register and its types?

What is the function of a status register?

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.

Which control register is used for paging?

Unlike segmentation, which is always enabled, paging must be explicitly enabled by software. In order to activate paging, the PG bit is set in the CR0 control register, and the physical address of the top level page table, the page directory, is set in the CR3 control register.

How many types of registers are there?

There are two types of registers. Some registers are internally in the processor while the other one is user-accessible. These two types of registers differ in their accessibility to computer architecture.

What is the purpose of the status register?

The status register lets an instruction take action contingent on the outcome of a previous instruction. Typically, flags in the status register are modified as effects of arithmetic and bit manipulation operations. For example, a Z bit may be set if the result of the operation is zero and cleared if it is nonzero.

How are control registers and data registers used?

Configuration/control registers are used by the CPU to configure and control the device. Bits in these configuration registers may be write-only, so the CPU can alter them, but not read them back. Most bits in control registers can be both read and written. Data registers are used to read data from or send data to the I/O device.

What is the relation between status register and control?

The IE flag in the Status register is used to mask off all the interrupt requests from the IRQ pin. It controls whenever the CPU will process an interrupt when IRQ is asserted. This status register is in the CPU. The device has a control block that recognises when to generate an interrupt request (the Interrupt generation logic in the scheme).

How to debug a control and status register?

Debug control and status register. Debug PC. Debug scratch register 0. Debug scratch register 1. Floating-Point Accrued Exceptions. Floating-Point Dynamic Rounding Mode. Hypervisor counter enable. Hypervisor exception delegation register. Hypervisor guest address translation and protection.

Is the receive status register the same as the data register?

The Receive Status Register/Error Clear Register provides the same four status bits as the Data Register (but in bits 3–0 rather than bit 11–8). The received data character must be read first from the Data Register, before reading the error status associated with that data character from this register.