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1.5-4

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AS3643

Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n

pointer is not written to before the initiation of a read mode the first address that is read is the last one stored in

the register pointer. The AS3643 must receive a “not acknowledge” to end a read.

Figure 28. Data Write - Slave Receiver Mode

Figure 29. Data Read (from Current Pointer Location) - Slave Transmitter Mode

Figure 30. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit

S

0110000

0

A

XXXXXXXX

A

AA

XXXXXXXX

XXXXXXXX

A

XXXXXXXX

P

<Slave Address>

<Word Address (n)>

<Data(n)>

<Data(n+1)>

<Data(n+X)>

S - Start

A - Acknowledge (ACK)

P - Stop

Data Transferred

(X + 1 Bytes + Acknowledge)

S

0110000

1

A

XXXXXXXX

A

AA

XXXXXXXX

XXXXXXXX

NA

XXXXXXXX

P

<Slave Address>

<Data(n)>

<Data(n+1)>

<Data(n+X)>

S - Start

A - Acknowledge (ACK)

P - Stop

NA - Not Acknowledge (NACK)

Data Transferred

(X + 1 Bytes + Acknowledge)

Note: Last data byte is followed by a NACK

<Data(n+2)>

S

0110000

0

A

XXXXXXXX

A

1

A

0110000

<Slave Address>

<Word Address (n)>

<Data(n+2)>

S - Start

Sr - Repeated Start

A - Acknowledge (ACK)

P - Stop

NA - Not Acknowledge (NACK)

XXXXXXXX

A

AA

XXXXXXXX

XXXXXXXX

NA

XXXXXXXX

P

<Data(n)>

<Data(n+1)>

<Data(n+X)>

Sr

Data Transferred

(X + 1 Bytes + Acknowledge)

Note: Last data byte is followed by a NACK