---
name: "abcrtc"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/abcrtc"
---

# abcrtc(4)

Abracon AB1805 real-time clock

## NAME

**abcrtc** – Abracon AB1805 real-time clock

## SYNOPSIS

**abcrtc\* at iic? addr 0x69**

## DESCRIPTION

The **abcrtc** driver provides support for the Abracon AB1805 real-time clock chip and similar variants.

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **abcrtc** driver first appeared in OpenBSD 6.5.

## AUTHORS

The **abcrtc** driver was written by Patrick Wildt ⟨*patrick@blueri.se*⟩.