CS42888 datasheet(35/61 Pages) CIRRUS

35 / 61 page

DS717F2

CS42888

next byte is the Memory Address Pointer (MAP) which selects the register to be read or written. If the op-

eration is a read, the contents of the register pointed to by the MAP will be output. Setting the auto-incre-

ment bit in MAP allows successive reads or writes of consecutive registers. Each byte is separated by an

acknowledge bit. The ACK bit is output from the CS42888 after each input byte is read, and is input to the

CS42888 from the microcontroller after each transmitted byte.

Since the read operation cannot set the MAP, an aborted write operation is used as a preamble. As shown

in Figure 24, the write operation is aborted after the acknowledge for the MAP byte by sending a stop con-

dition. The following pseudocode illustrates an aborted write operation followed by a read operation.

Send start condition.

Send 10010xx0 (chip address & write operation).

Receive acknowledge bit.

Send MAP byte, auto increment off.

Receive acknowledge bit.

Send stop condition, aborting write.

Send start condition.

Send 10010xx1(chip address & read operation).

Receive acknowledge bit.

Receive byte, contents of selected register.

Send acknowledge bit.

Send stop condition.

Setting the auto-increment bit in the MAP allows successive reads or writes of consecutive registers. Each

byte is separated by an acknowledge bit.

24 25

SCL

CHIP ADDRESS (WRITE)

MAP BYTE

DATA

DATA +1

START

ACK

STOP

ACK

0 AD1 AD0 0

SDA

INCR

16 17 18

10 11

13 14 15

27 28

DATA +n

Figure 23. Control Port Timing, I²C Write

SCL

CHIP ADDRESS (WRITE)

MAP BYTE

DATA

DATA +1

START

ACK

STOP

ACK

0 AD1 AD0 0

SDA

0 AD1 AD0 1

CHIP ADDRESS (READ)

START

INCR

12 13 14 15

20 21 22 23 24

26 27 28

10 11

17 18

ACK

DATA + n

STOP

Figure 24. Control Port Timing, I²C Read

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