AS3676 datasheet(80/92 Pages) AMSCO

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AS3676

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

Figure 37. Serial Interface Page Write

Byte Write and Page Write formats are used to write data to the slave.

The transmission begins with the START condition, which is generated by the master when the bus is in IDLE state

(the bus is free). The device-write address is followed by the word address. After the word address any number of data

bytes can be sent to the slave. The word address is incremented internally, in order to write subsequent data bytes on

subsequent address locations.

For reading data from the slave device, the master has to change the transfer direction. This can be done either with a

repeated START condition followed by the device-read address, or simply with a new transmission START followed by

the device-read address, when the bus is in IDLE state. The device-read address is always followed by the 1st register

byte transmitted from the slave. In Read Mode any number of subsequent register bytes can be read from the slave.

The word address is incremented internally.

The following diagrams show the serial read formats supported by the AS3676.

Figure 38. Serial Interface Random Read

Random Read and Sequential Read are combined formats. The repeated START condition is used to change the

direction after the data transfer from the master.

The word address transfer is initiated with a START condition issued by the master while the bus is idle. The START

condition is followed by the device-write address and the word address.

In order to change the data direction a repeated START condition is issued on the 1st CLKpulse after the ACKNOWL-

EDGE bit of the word address transfer. After the reception of the device-read address, the slave becomes the transmit-

ter. In this state the slave transmits register data located by the previous received word address vector. The master

responds to the data byte with a NOT ACKNOWLEDGE, and issues a STOP condition on the bus.

Figure 39. Serial Interface Sequential Read

Sequential Read is the extended form of Random Read, as multiple register-data bytes are subsequently transferred.

In contrast to the Random Read, in a sequential read the transferred register-data bytes are responded by an acknowl-

edge from the master. The number of data bytes transferred in one sequence is unlimited (consider the behavior of the

word-address counter). To terminate the transmission the master has to send a NOT ACKNOWLEDGE following the

last data byte and subsequently generate the STOP condition.

reg_data 1

reg_data 2

…

reg_datan

A P

Write Register

WA++

Write Register

WA++

Write Register

WA++

AS3675 (= Slave) receives data

AS3675 (= Slave) transmits data

A Sr

data

N P

Read Register

WA++

AS3675 (= slave) receives data

AS3675 (= slave) transmits data

A Sr

data 1

data 2

AS3675 (= slave) receives data

AS3675 (= slave) transmits data

...

data n

N P

Read Register

WA++

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