# `halt`

[Z80 Documentation](https://asm-editor.specy.app/documentation/z80.md) › [Instructions](https://asm-editor.specy.app/documentation/z80/instruction.md)

Web page: https://asm-editor.specy.app/documentation/z80/instruction/halt

Category: System

Suspends CPU operation until an interrupt or reset occurs.

1 byte · 4 cycles

Used in: [Getting started with the Z80](https://asm-editor.specy.app/learn/courses/z80/introduction/getting-started.md) (Z80 assembly), [Registers, pairs and the shadow set](https://asm-editor.specy.app/learn/courses/z80/introduction/registers-pairs-and-the-shadow-set.md) (Z80 assembly), [The 64 KB address space](https://asm-editor.specy.app/learn/courses/z80/introduction/the-64-kb-address-space.md) (Z80 assembly), [org, db, dw and ds](https://asm-editor.specy.app/learn/courses/z80/introduction/org-db-dw-and-ds.md) (Z80 assembly), [Bytes and 16-bit pairs](https://asm-editor.specy.app/learn/courses/z80/introduction/bytes-and-16-bit-pairs.md) (Z80 assembly), [The Z80 instruction set](https://asm-editor.specy.app/learn/courses/z80/introduction/the-z80-instruction-set.md) (Z80 assembly), [Addressing on the Z80](https://asm-editor.specy.app/learn/courses/z80/introduction/addressing-on-the-z80.md) (Z80 assembly), [The F register](https://asm-editor.specy.app/learn/courses/z80/introduction/the-f-register.md) (Z80 assembly), [Memory regions and executable files](https://asm-editor.specy.app/learn/courses/z80/introduction/memory-regions-and-executable-files.md) (Z80 assembly), [jp, jr and the conditions](https://asm-editor.specy.app/learn/courses/z80/think-in-assembly/jp-jr-and-the-conditions.md) (Z80 assembly)

## Flags

| Flag | Effect |
| --- | --- |
| S | not changed |
| Z | not changed |
| H | not changed |
| P/V | not changed |
| N | not changed |
| C | not changed |

## Forms

- `halt` · Suspends CPU operation until an interrupt or reset occurs.

## Example

```z80
        .org 0x8000
        halt
```