PCF8584 Ver la hoja de datos (PDF) - NXP Semiconductors.

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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

addressed as slave

no

(AAS = 1?)

yes

read byte from S1 register

Check whether

'addressed as slave'

Check that 'own address'

has arrived correctly

PIN bit = 0?

no

yes

read byte from S0 register

SLAVE

TRANSMITTER

MODE

R/W = 1

read byte from S1 register

read or write?

(LSB = 1 or 0?)

A0 = HIGH

A0 = LOW

Read incoming address to

determine if the R/W bit is 0 or 1

This will differentiate between

slave receiver or slave

transmitter modes.

R/W = 0

SLAVE

RECEIVER

MODE

read byte from S1 register

PIN bit = 0?

no

yes

negative

ACK received?

yes

(LRB = 1?)

no

write data to S0 register

write last data byte

to S0 register

END

TX

A0 = LOW

PIN deactivated

(set to '1')

PCF8584 goes into

slave receiver

mode

PIN bit = 0?

no

yes

STOP detected?

(STS = 1?)

yes

no

read data from S0 register

read last data byte

from S0 register

END

RX

MBE713

1997 Oct 21

Fig.9 Slave receiver/slave transmitter modes.

19

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