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PUSHF Instruction UM018809-0611

142

ZNEO

CPU Core

User Manual

PUSHF

Definition

PUSH Flags

Syntax

PUSHF

Operation

SP  SP

– 2

(SP)

 {00H, FLAGS[7:0]}

Description

The PUSHF instruction decrements the Stack Pointer (R15), loads the Flags register into the byte

pointed to by the Stack Pointer, and then decrements the Stack Pointer again. PUSHF decrements

the Stack Pointer twice so its alignment is not changed.

Flags

Flags are not affected by this instruction.

Syntax and Opcodes

Example

Before:

SP=FFFF_DB24H, Flags=B1H (C, S, V, IRQE=1; Z, B=0)

PUSHF ;Object Code: 0002

After:

SP=FFFF_DB22H, FFFF_DB22H=00H, FFFF_DB23H=B1H (1011_0001B)

Instruction, Operands Word 0 Word 1 Word 2

PUSHF 0002H

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 215 216

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