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$FreeBSD$
.Dd August 6, 1998 .Dt PCF 4 .Os .Sh NAME .Nm pcf .Nd Philips I2C bus controller .Sh SYNOPSIS .Cd "device pcf"
p In
a /boot/device.hints : .Cd hint.pcf.0.at="isa" .Cd hint.pcf.0.port="0x320" .Cd hint.pcf.0.irq="5"
p For one or more iicbus busses: .Cd "device iicbus" .Sh DESCRIPTION The .Em pcf driver provides support to the Philips PCF8584 I2C controller for the .Xr iicbus 4 system.
p 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. .Sh SEE ALSO .Xr iicbus 4 .Sh HISTORY The .Nm manual page first appeared in .Fx 3.0 . .Sh AUTHORS This manual page was written by .An Nicolas Souchu .