NAME    [Toc]    [Back]

     pcf -- Philips I2C bus controller

SYNOPSIS    [Toc]    [Back]

     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    [Toc]    [Back]

     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 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.

SEE ALSO    [Toc]    [Back]

     iicbus(4)

HISTORY    [Toc]    [Back]

     The pcf manual page first appeared in FreeBSD 3.0.

AUTHORS    [Toc]    [Back]

     This manual page was written by Nicolas Souchu.


FreeBSD 5.2.1			August 6, 1998			 FreeBSD 5.2.1