PCF8563 Просмотр технического описания (PDF) - Philips Electronics

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производитель

PCF8563

Real-time clock/calendar

Philips Electronics 

Philips Semiconductors

PCF8563

Real-time clock/calendar

8.9.5 I2C-bus protocol

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 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.

handbook, halfpage 1 0 1 0 0 0 A0 R/W

group 1

group 2

MRB016

Fig 10. Slave address.

Clock/calendar read/write cycles: The I2C-bus configuration for the different

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.

width

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from slave

S SLAVE ADDRESS 0 A WORD ADDRESS A

DATA

AP

R/W

n bytes

auto increment

memory word address

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

MBD822

9397 750 04855

Product specification

16 April 1999

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

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