What is auto decrement addressing mode?

What is auto decrement addressing mode?

Auto indexed ( decrement mode): Effective address of the operand is the contents of a register specified in the instruction. Before accessing the operand, the contents of this register are automatically decremented to point to the previous consecutive memory location. –( R1)

What is an example of auto increment mode of addressing?

Autoincrement mode: (Rn)+ When an instruction that uses autoincrement mode is executed, the following happens: the address of the operand is in Rn (previously executing instructions put it there.) the operand at that address is used. THEN the address in Rn is incremented (by 1, 2, 4, 8, or 16 depending on the opcode).

What is x86 addressing mode?

x86 addressing modes register addressing: MOV BX,CX (copy the 16-bit contents of C to B) immediate addressing: MOV AL,13H (load the low-order 8 bits of A with the value 13) direct addressing: MOV DL, [1234H] (uses the data segment register), JMP 100 (uses the code segment)

What does auto decrement mean?

The Auto Decrement feature in Ceridian HR/Payroll lets you set up a cycle data batch that automatically decreases any regular pay. The employee’s forecast pay would be skipped, meaning they would not get paid any regular pay. The employee would only be paid the hours keyed in the grid.

What are the instructions used for increment and decrement?

The inc and dec instructions use the following syntax: inc( mem/reg ); dec( mem/reg ); The single operand can be any legal 8-bit, 16-bit, or 32-bit register or memory operand. The inc instruction will add 1 to the specified operand, and the dec instruction will subtract 1 from the specified operand.

What is the addressing mode in add R1 R2?

6.4. 4 Addressing Modes

Operand Addressing Mode	Example	Description
Register
Register-only	ADD R3, R2, R1	R3 ← R2 + R1
Immediate-shifted register	SUB R4, R5, R9, LSR #2	R4 ← R5 − (R9 >> 2)
Register-shifted register	ORR R0, R10, R2, ROR R7	R0 ← R10 | (R2 ROR R7)