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The carry flag bit is not modified by which arithmetic operation in 8086?
Wiki User
∙ 10y ago
increment and decrement operations ie INC and DEC
Wiki User
∙ 10y ago
Saksham Kumar
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What are applications of 8086 microprocessor?
8086 main application is to evaluate the arithmetic operations in any systems that uses 8086
Difference between carry flag and overflow flag in 8086?
The carry flag indicates that an arithmetic operation between two numbers resulted in an unsigned carry or borrow. The overflow flag indicates that an arithmetic operation between two numbers resulted in an unexpected change in sign, i.e. an overflow. Carry is also like overflow. The difference is in interpretation. Do you consider the numbers signed or unsigned? Its all in interpretation because the hardware logic needed to add two numbers works the same, no matter if they are considered signed or unsigned. Both flags are set or cleared together, so you can use whichever you wish.
When does the overflow flag in 8086 set?
In the 8086/8088, the overflow flag is set when the result of an arithmetic instruction exceeds the bounds of the signed representation of a number. This is not the same as the carry flag, which is used for the unsigned representation. Both flags get set as needed. You decide which one to pay attention to.
What is an ax register?
It is one of 4 registers called general purpose registers Ax has a another name witch is (accumulator) it used in arithmetic and logic operation and store data from I/o port in microprocessors like 8086/8088
What is the meaning of postfixes of 8086?
It is mightily referring to Microprocessor 8086 . I think you saw "8086 microprocessor". The 8086 is nothing it indicates the number of microprocessor same as Digital or analog ic's . 8086 microprocessor has 20 Address buses and 8 data buses which has 1 Mb inbuilt memory for performing several type of airthmatical and logical operation.
What are the roles of BHE in 8086 microprocessor?
BHE is used to enable the high order bus so as to differentiate between a word operation and a byte operation.
What is usage parity bit in 8086 Microprocessor?
P (parity)is the count of '1's in the last 8 bits of any binary number expressed as even or odd. Logic 0 for odd parity; logic 1 for even parity.-if a number contains three binary one bits, it has odd parity-if a number contains no one bits, it has even parity
What is the difference between conditional and control flags in 8086 microprocessor?
Control Flag Register: The Control Flag Register (CFR), also known as the Program Status Word (PSW), is a register used to control the execution flow and behavior of the processor. It typically stores various control flags that govern different aspects of the CPU's operation. Some common flags found in the Control Flag Register include: Carry Flag (CF): Used to indicate whether an arithmetic operation generated a carry or borrow. Zero Flag (ZF): Indicates whether the result of an operation is zero. Sign Flag (SF): Indicates the sign (positive or negative) of the result. Overflow Flag (OF): Indicates whether an arithmetic operation resulted in an overflow. Interrupt Flag (IF): Determines whether interrupts are enabled or disabled. The Control Flag Register provides control over program execution, including branching, interrupt handling, and arithmetic operations. It helps determine the outcome of operations and can be used for conditional branching based on specific flag states. Conditional Flag Register: The Conditional Flag Register (CFR), also known as the Condition Code Register (CCR) or Status Register (SR), contains flags that reflect the result of the most recent arithmetic or logical operation performed by the processor. These flags are used to perform conditional branching and control the flow of instructions based on specific conditions. The flags present in the Conditional Flag Register can vary depending on the processor architecture, but some common flags include: Zero Flag (ZF): Indicates whether the result of an operation is zero. Sign Flag (SF): Indicates the sign (positive or negative) of the result. Overflow Flag (OF): Indicates whether an arithmetic operation resulted in an overflow. Carry Flag (CF): Used to indicate whether an arithmetic operation generated a carry or borrow. Auxiliary Carry Flag (AF): Indicates a carry or borrow from the lower-order nibble (4 bits) to the higher-order nibble. The Conditional Flag Register is primarily used for conditional jumps or branches, allowing the processor to alter the program flow based on the current flag states. To summarize, the Control Flag Register focuses on controlling the processor's behavior and handling interrupts, while the Conditional Flag Register reflects the outcome of arithmetic and logical operations and enables conditional branching based on flag states.
Condition flags available in 8086?
Conditional FlagsConditional flags represent result of last arithmetic or logical instruction executed. Conditional flags are as follows:1. CF (Carry Flag)This flag indicates an overflow condition for unsigned integer arithmetic. It is also used in multiple-precision arithmetic.2. AF (Auxiliary Flag)If an operation performed in ALU generates a carry/barrow from lower nibble (i.e. D0 - D3) to upper nibble (i.e. D4 - D7), the AF flag is set i.e. carry given by D3 bit to D4 is AF flag. This is not a general-purpose flag; it is used internally by the processor to perform Binary to BCD conversion.3. PF (Parity Flag)This flag is used to indicate the parity of result. If lower order 8-bits of the result contains even number of 1's, the Parity Flag is set and for odd number of 1's, the Parity Flag is reset.4. ZF (Zero Flag)It is set; if the result of arithmetic or logical operation is zero else it is reset.5. SF (Sign Flag)6. SF (Sign Flag)In sign magnitude format the sign of number is indicated by MSB bit. If the result of operation is negative, sign flag is set.7. OF (Overflow Flag)This stands for over flow flag. It occurs when signed numbers are added or subtracted. An OF indicates that the result has exceeded the capacity of machine. It becomes set if the sign result cannot express within the number of bites.Read More: http://www.daenotes.com/electronics/digital-electronics/8086-8088-microprocessor
What is coprocessor?
Co processor(8087 for 8086,80287 for 80286 etc) is also known as Math processor.It is a dedicated processor for performing arithmetic operations.It has very strong instruction set for numerical operations,faster than 8086 by 4 times.Normally 8086 and other microprocessors will take a lot of time to perform numerical operations and so in multiprocessor mode 8087 will work together with 8086 to solve numerical pronblems. The programmer can write a program with 8086 instructions and 8087 instructions together and so the speed will be improved.
What is responsible for performing arithmetic and logical instructions in a computer?
Microprocessor has a component known as ALU(arithmatic and logical unit) whcih is used to perform operations such as arithmetic includes-add,sub,mul(8086),div(8086) logical operations include-LOGICAL AND,LOGICAL OR,X-OR all thsi operations is perofrmed inside the ALU itself with the help of other components such as control unit and registers used as for the storage purposes Anand bhat(mca@kiit-870024)
what type of flags in 8086 and 8088 microprocessor and their uses?
There are nine flags in the 8086/8088.SF - Sign Flag - The result is negativeZF - Zero Flag - The result is zeroAF - Auxillary Carry Flag - A BCD carry occurredPF - Parity Flag - Indicates the oddness or evenness of the number of bitsCF - Carry Flag - An unsigned carry occurredOF - Overflow Flag - A signed overflow/carry occurredDF - Direction Flag - Controls the direction of repeated string operationsIF - Interrupt Flag - Enables or disables interruptsTF - Trace Flag - Controls the debug single step interruptIn general, most of these flags are set as a result of some arithmetic or logical instruction and can be tested using the conditional branch instructions. Exceptions are DF, which controls the directionality of repeated string operations, IF, which controls interrupts, and TF, which controls debugging.
