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PCF8583P Datasheet(PDF) 16 Page - NXP Semiconductors

Part # PCF8583P
Description  Clock/calendar with 240 x 8-bit RAM
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8583P Datasheet(HTML) 16 Page - NXP Semiconductors

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1997 Jul 15
16
Philips Semiconductors
Product specification
Clock/calendar with 240
× 8-bit RAM
PCF8583
9I2C-BUS PROTOCOL
9.1
Addressing
Before any data is transmitted on the I2C-bus, the device which should respond is addressed first. The addressing is
always carried out with the first byte transmitted after the start procedure.
The clock/calendar acts as a slave receiver or slave transmitter. Therefore the clock signal SCL is only an input signal,
but the data signal SDA is a bidirectional line.
The clock/calendar slave address is shown in Fig.16. Bit A0 corresponds to hardware address pin A0. Connecting this
pin to VDD or VSS allows the device to have one of two different addresses.
9.2
Clock/calendar READ/WRITE cycles
The I2C-bus configuration for the different PCF8583 READ and WRITE cycles is shown in Figs 17, 18 and 19.
Fig.16 Slave address.
handbook, halfpage
MRB016
101
00
0
A0 R/W
group 1
group 2
Fig.17 Master transmits to slave receiver (WRITE) mode.
handbook, full pagewidth
S
0A
SLAVE ADDRESS
WORD ADDRESS
A
A
DATA
P
acknowledgement
from slave
acknowledgement
from slave
acknowledgement
from slave
R/W
auto increment
memory word address
MBD822
n bytes


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