Philips Semiconductors

PCF8563

Real-time clock/calendar

Product specification

16 April 1999

15 of 30

9397 750 04855

© Philips Electronics N.V. 1999. All rights reserved.

8.9.5

respond is addressed first. The addressing is always carried out with the first byte

transmitted after the start procedure.

The PCF8563 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 PCF8563 slave address is shown in Figure 10.

PCF8563 read and write cycles are shown in Figure 11, 12 and 13. The word

address is a four bit value that defines which register is to be accessed next. The

upper four bits of the word address are not used.

Fig 10. Slave address.

Fig 11. Master transmits to slave receiver (write mode).

handbook, halfpage

MRB016

1

0

1

0

0

0

A0 R/W

group 1

group 2

width

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