VS6724 datasheet(47/118 Pages) STMICROELECTRONICS

47 / 118 page

VS6724

Host communication - I²C control interface

47/118

As mentioned in the previous example, the read message is terminated with a negative

acknowledge (A) from the master.

Figure 35. 16-bit index, 8-bit data random index, single data read

3.3.4

Multiple location write

For messages with more than 1 data byte the internal register index is automatically

incremented for each byte of data output, making it possible to write data bytes to

consecutive adjacent internal registers without having to send explicit indexes prior to

sending each data byte.

Figure 36. 16-bit index, 8-bit data multiple location write

‘0’ (Write)

DEV ADDR R/W A

DATA

INDEX[7:0]

INDEX[15:0]

value, M

INDEX[15:8]

DATA

DATA[7:0]

DEV ADDR R/W A

‘1’ (Read)

Previous Index Value, K

Index M

No Data Write

Data Read

A = Acknowledge

A = Negative Acknowledge

S = START Condition

Sr = repeated START

P = STOP Condition

From Slave to Master

From Master to Slave

‘0’ (Write)

DEV ADDR R/W A

DATA

A/A

DATA

INDEX[7:0]

DATA[7:0]

INDEX[15:0]

value, M

DATA[7:0]

INDEX[15:8]

DATA

DATA[7:0]

N Bytes of Data

Previous Index Value, K

Index M

Index (M + N - 1)

A = Acknowledge

A = Negative acknowledge

S = START condition

Sr = repeated START

P = STOP Condition

From Slave to Master

From Master to Slave

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