A flag reveals
whether a data structure is in a possible state range and may indicate a bit field attribute
, which is often permission-related. A microprocessor has multiple state registers that store multiple flag values that serve as possible post-processing condition indicators such as arithmetic overflow.
What are the various flags used in 8085 microprocessor?
- Carry flag (Cy),
- Auxiliary carry flag (AC),
- Sign flag (S),
- Parity flag (P), and.
- Zero flag (Z).
What is the use of flags in 8086 microprocessor?
| 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. |
|---|
What is importance of flag register?
The purposes of the FLAG registers are
to indicate the various statuses of the processor
. It is done by setting the individual bits called flags. There are two kinds of FLAGS; Status FLAG and Control FLAG. Status FLAG reflect the result of an operation executed by the processor.
What are the two types of flags?
- National Flags – Individuals and businesses alike fly these to show pride in their country, or to signify their country of origin.
- Provincial Flags-Each province has it’s own special flag these flags are usually flown at government offices.
What are the 8086 interrupt types?
The 8086 has two hardware interrupt pins, i.e.
NMI and INTR
. NMI is a non-maskable interrupt and INTR is a maskable interrupt having lower priority. One more interrupt pin associated is INTA called interrupt acknowledge.
What are the features of 8085 microprocessor?
- 1.It is an 8-bit microprocessor i.e. it can accept, process, or provide 8-bit data simultaneously.
- 2.It operates on a single +5V power supply connected at V
cc
; power supply ground is connected to V
ss
. - 3.It operates on clock cycle with 50% duty cycle.
- 4.It has on chip clock generator.
What is difference between carry and auxiliary carry flag?
The auxiliary carry flag
AF watches for a 4-bit (nibble) carry
, while the common carry flag CF watches for a carry-out from the MSB of the operand size.
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 the importance of zero flag?
Along with a carry flag, a sign flag and an overflow flag, the zero flag is
used to check the result of an arithmetic operation, including bitwise logical instructions
. It is set to 1, or true, if an arithmetic result is zero, and reset otherwise.
What is the function of DF flag?
Direction Flag (DF) – this flag is used by
some instructions to process data chains
, when this flag is set to 0 – the processing is done forward, when this flag is set to 1 the processing is done backward.
What is true microprocessor?
(a)
Microprocessor contains the essential elements of a computer
, while microcontroller does not. (b) Microcontroller contains the essential elements of a computer, while microprocessor does not. (c) A microprocessor contains the essential elements of a computer, which are fabricated generally on a single IC.
Why are flags so important?
A flag represents an idea, or an ideal. It is neither a mere piece of decoration, nor an object to be honoured for itself. It is honoured for what it represents. Many flags are
held in high esteem for their history
; for the sacrifices made by the people; for the qualities for which the country and people stand.
What are the types of flags?
- National flags are one of the symbols of a country. …
- International flags are flags that symbolize union of any type between nations.
- Maritime flags are the flags used at sea. …
- Sport flags are used in sports as a method of signalization. …
- Political flags can represent political parties.
What are flags used for?
Flags originally were used mainly in
warfare
, and to some extent they have remained insignia of leadership, serving for the identification of friend or foe and as rallying points. They are now also extensively employed for signaling, for decoration, and for display.
What are the two types of interrupts?
- Hardware Interrupts. …
- Software Interrupts. …
- Level-triggered Interrupt. …
- Edge-triggered Interrupt. …
- Shared Interrupt Requests (IRQs) …
- Hybrid. …
- Message–Signalled. …
- Doorbell.
