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Figure 28. Data Transfer on I C Serial Bus
AS3647/47B
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n
2
SDA
MSB
SLAVE
ADDRESS
R/W
DIRECTION
BIT
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
SCL
1
2
6
7
8
9
1
2
3-7
8
9
ACK
START
CONDITION
REPEATED IF
MORE BYTES ARE
TRANSFERRED
STOP CONDITION
OR REPEATED
START CONDITION
0110000, followed by the direction bit (R/W), which, for a write, is 0. After receiving and decoding the slave
Depending upon the state of the R/W bit, two types of data transfer are possible:
1. Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is the
slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after each received
byte. Data is transferred with the most significant bit (MSB) first.
2. Data transfer from a slave transmitter to a master receiver. The master transmits the first byte (the slave
address). The slave then returns an acknowledge bit, followed by the slave transmitting a number of data
bytes. The master returns an acknowledge bit after all received bytes other than the last byte. At the end of the
last received byte, a “not acknowledge” is returned. The master device generates all of the serial clock pulses
and the START and STOP conditions. A transfer is ended with a STOP condition or with a repeated START
condition. Since a repeated START condition is also the beginning of the next serial transfer, the bus is not
released. Data is transferred with the most significant bit (MSB) first.
The AS3647/47B can operate in the following two modes:
1. Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCL. After each
byte is received an acknowledge bit is transmitted. START and STOP conditions are recognized as the begin-
ning and end of a serial transfer. Address recognition is performed by hardware after reception of the slave
address and direction bit (see Figure 29) . The slave address byte is the first byte received after the master
generates the START condition. The slave address byte contains the 7-bit AS3647/47B address, which is
9
address byte the device outputs an acknowledge on the SDA line. After the AS3647/47B acknowledges the
slave address + write bit, the master transmits a register address to the AS3647/47B. This sets the register
pointer on the AS3647/47B. The master may then transmit zero or more bytes of data, with the AS3647/47B
acknowledging each byte received. The address pointer will increment after each data byte is transferred. The
master generates a STOP condition to terminate the data write.
2. Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmit-
ted on SDA by the AS3647/47B while the serial clock is input on SCL. START and STOP conditions are recog-
nized as the beginning and end of a serial transfer ( Figure 30 and Figure 31 ). The slave address byte is the
first byte received after the master generates a START condition. The slave address byte contains the 7-bit
AS3647/47B address, which is 0110000, followed by the direction bit (R/W), which, for a read, is 1.
10
After
receiving and decoding the slave address byte the device outputs an acknowledge on the SDA line. The
AS3647/47B then begins to transmit data starting with the register address pointed to by the register pointer. If
9. The address for writing to the AS3647/47B is 60h = 01100000b
10.The address for read mode from the AS3647/47B is 61h = 01100001b
www.austriamicrosystems.com/AS3647
1.5-4
21 - 37
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