pcf(4)

NAME

pcf - Philips I2C bus controller

SYNOPSIS

device pcf
In /boot/device.hints:
hint.pcf.0.at="isa"
hint.pcf.0.port="0x320"
hint.pcf.0.irq="5"
For one or more iicbus busses:
device iicbus

DESCRIPTION

The pcf driver provides support to the Philips PCF8584 I2C

controller for
the iicbus(4) system.

The PCF8584 is an integrated circuit designed in CMOS tech

nology 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 hand

shake. It controls all the I2C-bus specific sequences, protocol, arbitra

tion and timing. The PCF8584 allows parallel-bus systems to communicate

bidirectionally with the I2C-bus.

SEE ALSO

iicbus(4)

HISTORY

The pcf manual page first appeared in FreeBSD 3.0.

AUTHORS

This manual page was written by Nicolas Souchu.

BSD August 6, 1998

BSD