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PCF8584

I2C-bus controller

NXP Semiconductors. 

Philips Semiconductors

I2C-bus controller

Product specification

PCF8584

handbook, full pagewidth

START

read byte from S1 register

A0 = HIGH

is bus busy?

yes

(BB = 0?)

no

send byte 'slave address'

PCF8584 remains in

master transmitter

mode if R/W bit of

'slave address' = 0

send C5H to control

register S1

n = 0 (data byte counter);

m = number of data bytes

to be transferred

read byte from S1 register

A0 = LOW

Load 'slave address' into S0 register:

'slave address' = value of slave address

(7-bits + R/W = 0). After reset, default = '0'

A0 = HIGH

Load C5H into S1. 'C5H' = PCF8584 generates

the 'START' condition and clocks out the slave

address and the clock pulse for slave acknowledgement.

Next byte(s) sent to the S0 register will be immediately

transferred over the I2C-bus.

A0 = HIGH

Poll for transmission finished.

PIN bit = 0?

no

yes

slave

acknowledged?

(LRB = 0?)

yes

n=m

yes

no

n=n+1

transmission

completed

send byte C3H

send byte 'data'

A0 = LOW

Load 'data'

into bus

buffer register S0;

data is transmitted.

END

A0 = HIGH

Load C3 into the S1 control

register: PCF8584 generates

'STOP' condition.

PCF8584 goes into

slave receiver mode

MBE715

1997 Oct 21

Fig.6 PCF8584 master transmitter mode.

16

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