PCF85263AT datasheet(65/100 Pages) NXP

65 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

65 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

10. Interface protocol

The PCF85263A uses the I2C interface for data transfer. Interpretation of the data is

determined by the interface protocol.

10.1 Write protocol

After the I2C slave address is transmitted, the PCF85263A requires that the register

address pointer is defined. It can take the value 00h to 2Fh. Values outside of that range

will result in the transfer being ignored, however the slave will still respond with

acknowledge pulses.

After the register address is transmitted, write data is transmitted. The minimum number

of data write bytes is 0 and the maximum number is unlimited. After each write, the

address pointer increments by one. After address 2Fh, the address pointer will roll over to

00h.

• I2C START condition

• I2C slave address + write

• register address

• write data

• :

• write data

• I2C STOP condition; an I2C RE-START condition is also possible.

10.2 Read protocol

When reading the PCF85263A, reading starts at the current position of the address

pointer. The address pointer for read data should first be defined by a write sequence.

• I2C START condition

• I2C slave address + write

• register address

• I2C STOP condition; an I2C RE-START condition is also possible.

After setting the address pointer, a read can be executed. After the I2C slave address is

transmitted, the PCF85263A will immediately output read data. After each read, the

address pointer increments by one. After address 2Fh, the address pointer will roll over to

00h.

• I2C START condition

• I2C slave address + read

• read data (master sends acknowledge bit)

• :

• read data (master sends not-acknowledge bit)

• I2C STOP condition. An I2C RE-START condition is also possible.

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