PCF8573P NXP Semiconductors, PCF8573P Datasheet - Page 9

• Manufacturer Part Number: PCF8573P
• Manufacturer: NXP Semiconductors

Specifications of PCF8573P

• Time Format: HH:MM:SS
• Package Type: PDIP
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 16
• Mounting: Through Hole
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
9
9.1
Before any data is transmitted on the I
always done 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.8. Bits A0 and A1 correspond to the two hardware address pins A0 and
A1. Connecting these to V
9.2
The I
The write cycle is used to set the time counter, the alarm register and the flags. The transmission of the clock/calendar
address is followed by the MODE-POINTER-word which contains a CONTROL-nibble (Table 3) and an
ADDRESS-nibble (Table 4). The ADDRESS-nibble is valid only if the preceding CONTROL-nibble is set to EXECUTE
ADDRESS. The third transmitted word contains the data to be written into the time counter or alarm register.
2003 Jan 27
handbook, full pagewidth
Clock/calendar with serial I/O
I
2
2
C-BUS PROTOCOL
C-bus configuration for different clock/calendar READ and WRITE cycles is shown in Figs 9, 10 and 11.
Addressing
Clock/calendar READ/WRITE cycles
S
Fig.9 Master transmitter transmits to clock/calendar slave receiver.
DD
CLOCK/CALENDAR
or V
ADDRESS
handbook, halfpage
SS
allows the device to have 1 of 4 different addresses.
2
C-bus, the device which should respond is addressed first. The addressing is
msb
acknowledge
1
from slave
R/W
0
A
0 C2 C1 C0 0 B2 B1 B0
1
Fig.8 Slave address.
MODE POINTER
0
1
9
0
acknowledge
from slave
A1
A
msb
A0
MBL807
R/W
(n = 0, 1, 2, ...)
lsb
DATA
n bytes
acknowledge
auto increment
from slave
lsb
of B1, B0
A
MBL808
P
Product specification
PCF8573