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MCPRTC(4) Device Drivers Manual MCPRTC(4)

mcprtcMicrochip MCP79400 real-time clock

mcprtc* at iic? addr 0x6f

The mcprtc driver provides support for the Microchip MCP79400 real-time clock chip and similar variants.

iic(4), intro(4)

The mcprtc driver first appeared in OpenBSD 6.6.

The mcprtc driver was written by Patrick Wildt <>.

September 6, 2019 OpenBSD-7.1