CS43L36 datasheet(46/89 Pages) CIRRUS

46 / 89 page

DS1081F3

CS43L36

4.10 Control-Port Operation

For write operations, the bytes following the MAP byte are written to the CS43L36 register addresses pointed to by the

last received MAP address, plus however many autoincrements have occurred. Note that, while writing, any

autoincrementing block accesses that go past the maximum 0x7F address write to address 0x00—the page address. The

writes then continue to the newly selected page. Fig. 4-27 shows a write pattern with autoincrementing.

Figure 4-27. Control-Port Timing, I2C Writes with Autoincrement

For read operations, the contents of the register pointed to by the last received MAP address, plus however many

autoincrements have occurred, are output in the next byte. While reading, any autoincrementing block access that goes

past the maximum 0x7F address wraps around and continues reading from the same page address. Fig. 4-28 shows a

read pattern following the write pattern in Fig. 4-27. Notice how read addresses are based on the MAP byte from Fig. 4-27.

Figure 4-28. Control-Port Timing, I2C Reads with Autoincrement

To generate a read address not based on the last received MAP address, an aborted write operation can be used as a

preamble (see Fig. 4-29). Here, a write operation is aborted (after the ACK for the MAP byte) by sending a Stop condition.

24 25

SCL

CHIP ADDRESS(WRITE)

MAP BYTE

DATA

START

STOP

ACK

SDA

1 0

16 17 18 19

10 11

13 14 15

27 28

DATA

SDA

Source

Master

Pullup

Slave

Master

Pullup

ACK

7 6

4 3

1 0

MAP Addr = X

Master

Slave

7 6

1 0

6 1

Addr = 10010

SCL

SDA

Source

Pullup

DATA

STOP

ACK

CHIP ADDRESS (READ)

START

ACK

DATA

Master

Slave

Master

Master Pullup

Addr = 10010

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