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