ata5428 ATMEL Corporation, ata5428 Datasheet - Page 50

• Manufacturer Part Number: ata5428
• Description: Uhf Ask/fsk Transceiver
• Manufacturer: ATMEL Corporation

8.4
Figure 8-4.
8.5
8.6
8.7
50
Command: Write Control Register
Command: OFF Command
Command: Delete IRQ
Command Structure
ATA5423/ATA5425/ATA5428/ATA5429
SDO_TMDO
SDI_TMDI
Write Control Register
SCK
CS
Command: Write Control Register X
No. Bytes in the TX/RX Data Buffer
MSB
The control registers can be written individually or successively. An echo of the command and
the data bytes are provided for the microcontroller on pin SDO_TMDO.
If AVCC_EN in control register 1 is “0”, the input level on pin PWR_ON is low and on the key
inputs Tn is high, then the OFF command sets the transceiver in the OFF mode.
Figure 8-5.
The delete IRQ command sets pin IRQ to low.
Figure 8-6.
The three most significant bits of the command (bit 5 to bit 7) indicate the command type. Bit 0 to
bit 4 describe the target address when reading or writing a control or status register. In all other
commands bit 0 to bit 4 have no effect and should be set to “0” for compatibility with future
products.
OFF Command
Delete IRQ
LSB
MSB
Write Control Register X
Data Control Register X
SDO_TMDO
SDO_TMDO
SDI_TMDI
SDI_TMDI
SCK
SCK
CS
CS
LSB
No. Bytes in the TX/RX Data Buffer
No. Bytes in the TX/RX Data Buffer
MSB
MSB
Command: OFF Command
Command: Delete IRQ
Command: Write Control Register Y
MSB
Data Control Register X
LSB
LSB
LSB
4841D–WIRE–10/07