PCF8563 datasheet(23/45 Pages) NXP

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PCF8563

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Product data sheet

Rev. 9 — 16 June 2011

23 of 45

NXP Semiconductors

PCF8563

Real-time clock/calendar

9.5 I2C-bus protocol

9.5.1 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 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.

Two slave addresses are reserved for the PCF8563:

Read: A3h (10100011)

Write: A2h (10100010)

The PCF8563 slave address is illustrated in Figure 18.

9.5.2 Clock and calendar READ or WRITE cycles

The I2C-bus configuration for the different PCF8563 READ and WRITE cycles is shown in

Figure 19, Figure 20 and Figure 21. The register address is a 4-bit value that defines

which register is to be accessed next. The upper four bits of the register address are not

used.

Fig 18. Slave address

mce189

R/W

group 1

group 2

Fig 19. Master transmits to slave receiver (WRITE mode)

SLAVE ADDRESS

DATA

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from slave

R/W

auto increment

memory register address

013aaa346

n bytes

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