PCF8584T NXP Semiconductors, PCF8584T Datasheet - Page 17

• Manufacturer Part Number: PCF8584T
• Manufacturer: NXP Semiconductors

Specifications of PCF8584T

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: SO
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

Philips Semiconductors
1997 Oct 21
handbook, full pagewidth
I
(1) The first read of the S0 register is a ‘dummy read’ of the slave address which should be discarded. The first read of the S0 register simultaneously
2
C-bus controller
reads the current value of S0 and then transfers the first valid data byte from the I
n = n
1
yes
send byte C5H to S1 control register
no
read byte from S1 status register
read data byte from S0 register
read byte from S1 status register
send byte 'slave address' to S0
m = number of data bytes
n = 0 (data byte counter)
is bus busy?
slave ACK?
(LRB = 0?)
n = m
to be read
(BB = 0?)
PIN = 0?
START
no
yes
yes
1?
A0 = HIGH
A0 = HIGH
A0 = HIGH
A0 = LOW
A0 = LOW
has occured)
(an error
no
(1)
Fig.7 PCF8584 master receiver mode.
Is the I
Load 'Slave Address' into S0 register:
'Slave Address' = 7 bits
PCF8584 generates 'START' condition,
sends out slave address
generates 9th clock pulse for slave ACK.
Set-up software counters.
send byte 40H to control register S1
read final data byte from S0 register
no
read data byte from S0 register
read byte from S1 status register
17
2
C-bus busy?
send byte C3H to S1
PIN = 0?
END
2
C-bus to S0.
yes
A0 = HIGH
A0 = HIGH
A0 = HIGH
A0 = LOW
A0 = LOW
R/W = 1.
RD to I
(1)
2
C-bus and
Set ACK bit S1 to 0 in
preparation for negative
acknowledgement.
This command simultaneously
receives the final data byte
from the I
it into register S0.
Neg. ACK is also sent.
PCF8584 generates
'STOP' condition.
PCF8584 goes into
slave receiver mode.
This command transfers
the final data byte from
the data buffer to accumulator.
Because the STOP condition
was previously executed, no
I
2
C-bus activity takes place.
2
C-bus and loads
Product specification
PCF8584
MGL009