VP306 datasheet(26/85 Pages) MITEL

26 / 85 page

VP305/6

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on the title page of this document.

2.4. RADD: I²C Register address - Serial mode only.

Not available on VP305.

RADD is the I²C register address. It is the first byte written after the VP306 I²C chip address when

in write mode.

To write to the chip, the microprocessor should send a START condition and the chip address with

the write bit set, followed by the register address where subsequent data bytes are to be written.

Finally, when all the 'message' has been sent, a STOP condition is sent to free the bus.

To read from the chip from register address one, the microprocessor should send a START

condition and the chip address with the read bit set, followed by the requisite number of SCL

clocks to read the bytes out. Finally a STOP condition is sent to free the bus. RADD is not sent in

this case.

To read from the chip from an address other than one, the microprocessor should send the chip

address with the write bit set, followed by the register address where subsequent data bytes are to

be read from. Then the microprocessor should send a START condition and the chip address with

the read bit set, followed by the requisite number of SCL clocks to read the bytes out. Finally a

STOP condition is sent to free the bus. This case should also be used to read the chip

identification number in register zero.

A STOP condition shall reset the RADD value to 01. For examples of use, see page 59.

Serial mode - Address none.

Type Write.

7654

3210

R/W

IAI

AD6

AD5

AD4

AD3

AD2

AD1

AD0

AD[6:0]

I²C register address, numbers in the range 0 to 63 are allowed. AD6 should be set

to zero.

IAI

High = Inhibit auto increment.

Low = Increment addresses.

The IAI bit and function is only available via the I²C port. When the address is

incremented to 63 it stops and the bus will continue to write to or read from 'register'

63 until a STOP condition is sent. Since 'register' 63 does not exist, data writen to it

is lost or it will read back 255.

VP306 Datasheet(PDF) 26 Page - Mitel Networks Corporation

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