DI

 

Opcode

Operand

Description

DI

None

Disable interrupt

 

 

—  The interrupt enable flip-flop is reset and all the interrupts except the TRAP are disabled.

—  No flags are affected.

—  Example: DI


Comments

Post a Comment

Popular posts from this blog

MOV

  Opcode Operand Description MOV Rd,Rs Rd,M M, Rs Copy from source to destination.   —    This instruction copies the  contents  of the source  register into   the destination register. —    The  contents  of the source  register are  not   altered. —    If one of the operands is a memory location, its location is specified   by the contents of the HL registers. —    Example:  MOV  B,   C —     MOV  B,   M —    MOV M,   C  
Read more

JX- JC, JNC, JP, JM, JZ, JNZ, JPE, JPO

  Opcode Operand Description Jx 16-bit address Jump conditionally     —    The  program  sequence is  transferred  to  the   memory location specified  by  the  16 -bit address  given  in the  operand  based on the specified  flag  of the   PSW. —    Example:  JZ 20 3 4   H. Opcode Description Status Flags JC Jump if Carry CY = 1 JNC Jump if No Carry CY = 0 JP Jump if Positive S = 0 JM Jump if Minus S = 1 JZ Jump if Zero Z = 1 JNZ Jump if No Zero Z = 0 JPE Jump if Parity Even P = 1 JPO Jump if Parity Odd P = 0
Read more

LXI

  Opcode Operand Description LXI Reg. pair, 16-bit data Load register pair immediate     —    This   instruction   loads   16 -bit   data   in   the   register   pair. —    Example:  LXI H, 2 03 4   H
Read more