CS42L51 datasheet(44/88 Pages) CIRRUS

44 / 88 page

DS679F1

CS42L51

the contents of the register pointed to by the MAP will be output. Setting the auto-increment 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 CS42L51 after each input byte is read and is input to the CS42L51 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 25, 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 100101x0 (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 100101x1 (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

AD0

SDA

INCR

16 17 18

10 11

13 14 15

27 28

DATA +n

Figure 24. Control Port Timing, I²C Write

SCL

CHIP ADDRESS (WRITE)

MAP BYTE

DATA

DATA +1

START

ACK

STOP

ACK

0 1 AD0 0

SDA

1 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 25. Control Port Timing, I²C Read

CS42L51 Datasheet(PDF) 44 Page - Cirrus Logic

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