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+.\" Copyright (c) 1998, Nicolas Souchu
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 6, 1998
+.Dt PCF 4
+.Os
+.Sh NAME
+.Nm pcf
+.Nd Philips I2C bus controller
+.Sh SYNOPSIS
+.Cd "device pcf"
+.Pp
+In
+.Pa /boot/device.hints :
+.Cd hint.pcf.0.at="isa"
+.Cd hint.pcf.0.port="0x320"
+.Cd hint.pcf.0.irq="5"
+.Pp
+For one or more iicbus busses:
+.Cd "device iicbus"
+.Sh DESCRIPTION
+The
+.Em pcf
+driver provides support to the Philips PCF8584 I2C controller for the
+.Xr iicbus 4
+system.
+.Pp
+The PCF8584 is an integrated circuit designed in CMOS technology which serves
+as an interface between most standard parallel-bus
+microcontrollers/microprocessors and the serial I2C-bus.
+The PCF8584
+provides both master and slave functions.
+Communication with I2C-bus is
+carried out on a byte-wise basis using interrupt or polled handshake.
+It
+controls all the I2C-bus specific sequences, protocol, arbitration and timing.
+The PCF8584 allows parallel-bus systems to communicate bidirectionally with
+the I2C-bus.
+.Sh SEE ALSO
+.Xr iicbus 4
+.Sh HISTORY
+The
+.Nm
+manual page first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Nicolas Souchu .