Nettet3. jun. 2024 · Intel 80×86 Assembly Language OpCodes. Instruction syntax op Instruction OpCode xx SUB dest,src Modifies flags Computer Organization & Assembly Languages Assembly Language for Intel-Based Computers, How the SUB instruction modifies OF and CF: 9.3 Instruction fetch, Optimizing subroutines in assembly … NettetFlags Affected by Arithmetic • The ALU has a number of status flags that reflect the o tcome of arithmetic (and bit ise) reflect the outcome of arithmetic (and bitwise) …
Stf mem32 flags this instruction modifies the - Course Hero
NettetSets the carry flag to 1. Example. Set the carry flag: stc Clear Interrupt Flag (cli) cli Operation. 0 -> IF . Description. Clears the interrupt flag if the current privilege level is at least as privileged as IOPL; affects no other flags. External interrupts disabled at the end of the cli instruction or from that point on until the interrupt ... NettetModifies Flags: CF PF SF ZF (OF,AF undefined) ... Sets the Direction Flag to 1 causing string instructions to auto-decrement SI and DI instead of auto-increment. Clocks: operands: 286: 386: 486: Size Bytes; none : 2 : 2 : 2 : 1 : STI - Set Interrupt Flag (Enable Interrupts) Usage: STI . Modifies Flags: IF . redmoor school bodmin
How to set flags in microprocessor 8085 after IN instruction?
NettetModifies Flags: AF CF DF IF PF SF TF ZF Returns control to point of interruption by popping IP, CS and then the Flags from the stack and continues execution at this location. CPU exception interrupts will return to the instruction that cause the exception because the CS:IP placed on the stack during the interrupt is the address of the offending … NettetFLAGS EFLAGS Instruction Pointer EIP IP 00 000 0 0 00 Status Flags CF = Carry Flag PF = Parity Flag ZF = Zero Flag SF = Sign Flag OF = Overflow Flag AF = Auxiliary … http://service.scs.carleton.ca/sivarama/asm_book_web/Student_copies/ch6_arithmetic.pdf richard tehan