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.Dd August 6, 1998 26.Dt PCF 4 27.Os 28.Sh NAME 29.Nm pcf 30.Nd Philips I2C bus controller 31.Sh SYNOPSIS 32.Cd "device pcf" 33.Pp 34In 35.Pa /boot/device.hints : 36.Cd hint.pcf.0.at="isa" 37.Cd hint.pcf.0.port="0x320" 38.Cd hint.pcf.0.irq="5" 39.Pp 40For one or more iicbus busses: 41.Cd "device iicbus" 42.Sh DESCRIPTION 43The 44.Em pcf 45driver provides support to the Philips PCF8584 I2C controller for the 46.Xr iicbus 4 47system. 48.Pp 49The PCF8584 is an integrated circuit designed in CMOS technology which serves 50as an interface between most standard parallel-bus 51microcontrollers/microprocessors and the serial I2C-bus. 52The PCF8584 53provides both master and slave functions. 54Communication with I2C-bus is 55carried out on a byte-wise basis using interrupt or polled handshake. 56It 57controls all the I2C-bus specific sequences, protocol, arbitration and timing. 58The PCF8584 allows parallel-bus systems to communicate bidirectionally with 59the I2C-bus. 60.Sh SEE ALSO 61.Xr iicbus 4 62.Sh HISTORY 63The 64.Nm 65manual page first appeared in 66.Fx 3.0 . 67.Sh AUTHORS 68This 69manual page was written by 70.An Nicolas Souchu . 71