1.\" Copyright (c) 1998, Nicolas Souchu 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd August 6, 1998 28.Dt PCF 4 29.Os 30.Sh NAME 31.Nm pcf 32.Nd Philips I2C bus controller 33.Sh SYNOPSIS 34.Cd "device pcf" 35.Pp 36In 37.Pa /boot/device.hints : 38.Cd hint.pcf.0.at="isa" 39.Cd hint.pcf.0.port="0x320" 40.Cd hint.pcf.0.irq="5" 41.Pp 42For one or more iicbus busses: 43.Cd "device iicbus" 44.Sh DESCRIPTION 45The 46.Em pcf 47driver provides support to the Philips PCF8584 I2C controller for the 48.Xr iicbus 4 49system. 50.Pp 51The PCF8584 is an integrated circuit designed in CMOS technology which serves 52as an interface between most standard parallel-bus 53microcontrollers/microprocessors and the serial I2C-bus. 54The PCF8584 55provides both master and slave functions. 56Communication with I2C-bus is 57carried out on a byte-wise basis using interrupt or polled handshake. 58It 59controls all the I2C-bus specific sequences, protocol, arbitration and timing. 60The PCF8584 allows parallel-bus systems to communicate bidirectionally with 61the I2C-bus. 62.Sh SEE ALSO 63.Xr iicbus 4 64.Sh HISTORY 65The 66.Nm 67manual page first appeared in 68.Fx 3.0 . 69.Sh AUTHORS 70This 71manual page was written by 72.An Nicolas Souchu . 73