What is IDIV instruction?
The IDIV (signed divide) instruction performs signed integer division, using the same operands as the DIV instruction. For both DIV and IDIV, all of the arithmetic status flags are undefined after the operation. When doing 8-bit division, you must sign-extend the dividend into AH before using IDIV.
What is the difference between the Imul and MUL instructions with an example?
mul is used for unsigned multiplication whereas imul is used for signed multiplication. Algorithm for both are same, which is as follows: when operand is a byte: AX = AL * operand.
What is Div microprocessor?
The DIV instruction is used to divide an unsigned word (doubleword) by a byte (word). For word-byte division, the word must be in the AX register; the divisor can be in a reg or a mem location. After the division, AL contains the quotient and AH contains the remainder.
Which flag is affected by IDIV operation?
Flags Affected ¶ The CF, OF, SF, ZF, AF, and PF flags are undefined.
Which flag is used in compare operations?
Compare (register or memory) with accumulator (CMP R/M) – It compares the data byte in the register or memory with the contents of accumulator. If A less than (R/M), the CY flag is set and Zero flag is reset. If A equals to (R/M), the Zero flag is set and CY flag is reset.
Does CMP affect carry flag?
After operation between operands, result is always stored in first operand. CMP and TEST instructions affect flags only and do not store a result (these instruction are used to make decisions during program execution). These instructions affect these flags only: SUB – Subtract second operand to first.
Which instruction will immediately load a 16-bit address into a register pair?
8085 Data-transfer Instructions
| Opcode | Operand | Meaning |
|---|---|---|
| LXI | Reg. pair, 16-bit data | Load the register pair immediate |
| LHLD | 16-bit address | Load H and L registers direct |
| STA | 16-bit address | 16-bit address |
| STAX | 16-bit address | Store the accumulator indirect |
Is a 16 bit register used to hold the address of the next instruction to be executed?
Explanation: Program counter : It is a 16-bit register used to store the memory address location of the next instruction to be executed. 7.
Which register holds the next instruction to be executed?
program counter