ATA5423 ATMEL Corporation, ATA5423 Datasheet - Page 49

• Manufacturer Part Number: ATA5423
• Manufacturer: ATMEL Corporation

8. Transceiver Configuration
8.1
Figure 8-1.
8.2
Figure 8-2.
8.3
Figure 8-3.
4841A–RKE–02/05
Command: Read TX/RX Data Buffer
Command: Write TX/RX Data Buffer
Command: Read Control/Status Register
SDI_TMDI
SDO_TMDO
SCK
CS
SDI_TMDI
SDO_TMDO
SCK
CS
SDI_TMDI
SDO_TMDO
SCK
CS
Read TX/RX Data Buffer
Write TX/RX Data Buffer
Read Control/Status Register
MSB
Command: Write TX/RX Data Buffer
No. Bytes in the TX/RX Data Buffer
MSB
MSB
Command: Read TX/RX Data Buffer
No. Bytes in the TX/RX Data Buffer
No. Bytes in the TX/RX Data Buffer
Command: Read C/S Register X
The configuration of the transceiver takes place via a 4-wire serial interface (CS, SCK,
SDI_TMDI, SDO_TMDO) and is organized in 8-bit units. The configuration is initiated with an
8-bit command. While shifting the command into pin SDI_TMDI, the number of bytes in the
TX/RX data buffer are available on pin SDO_TMDO. The read and write commands are followed
by one or more 8-bit data units. Each 8-bit data transmission begins with the MSB. The serial
interface is in the reset state if the level on pin CS = Low.
During a RX operation, the user can read the received bytes in the TX/RX data buffer
successively.
During a TX operation the user can write the bytes in the TX/RX data buffer successively. An
echo of the command and the TX data bytes are provided for the microcontroller on pin
SDO_TMDO.
The control and status registers can be read individually or successively.
LSB
LSB
LSB
MSB
MSB
MSB
Command: Read C/S Register Y
Write TX/RX Data Buffer
Data C/S Register X
RX Data Byte 1
TX Data Byte 1
X
ATA5423/25/28/29 [Preliminary]
LSB
LSB
LSB
MSB
MSB
MSB
Command: Read C/S Register Z
Data C/S Register Y
RX Data Byte 2
TX Data Byte 2
TX Data Byte 1
X
LSB
LSB
LSB
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