ST25RU3993 datasheet(21/90 Pages) STMICROELECTRONICS

21 / 90 page

DocID029764 Rev 5

21/90

ST25RU3993

Functional overview

command should not be sent if reception is automatically triggered by a data

transmission command.

•

Query (98h): the Query command issues the EPC Query, which starts the inventory

round. The Query command requires additional two data bytes which should be written

to the FIFO (3Fh):

The two bytes in the FIFO should contain: “00”, DR, M, TRext, Sel, Session, Target, Q

Since this adds-up to 15 applicable bits, the LSB bit is disregarded.

The transmitter in the end sends:

–Preamble

–

Command ID

–

Tx data (two bytes from FIFO)

–

CRC-5.

The received RN16 is stored in the internal RN16 register for further communication

steps (ACK, ReqRN). RN16 is also stored in the FIFO.

•

QueryRep (99h): the QueryRep command issues the EPC Gen2 QueryRep command

followed by two session bits. The session bits are taken from Tx setting register (3Ch).

The received RN16 is stored in the internal RN16 register for further communications

(ACK, ReqRN). RN16 is also accessible in the FIFO.

•

QueryAdjustUp (9Ah): the QueryAdjustUp direct command issues the EPC Gen2

QueryAdjust command followed by two session bits and ‘up’ parameter (increasing the

number of available slots). The session bits are taken from Tx setting register (3Ch).

The received RN16 is stored in the internal RN16 register for further communications

(ACK, ReqRN). RN16 is also accessible in the FIFO.

•

QueryAdjustNic (9Bh): the QueryAdjustNic command issues the EPC Gen2

QueryAdjust command followed by two session bits and ‘no change’ parameter. The

session bits are taken from Tx setting register (3Ch). The received RN16 is stored in

the internal RN16 register for further communications (ACK, ReqRN). RN16 is also

accessible in the FIFO.

•

QueryAdjustDown (9Ch): the QueryAdjustUp command issues the EPC Gen2

QueryAdjust followed by two session bits and ‘down’ parameter (decreasing the

number of available slots). The session bits are taken from Tx setting register(3Ch).

The received RN16 is stored in the internal RN16 register for further communications

(ACK, ReqRN). RN16 is also accessible in the FIFO.

•

ACK (9Dh): the ACK command issues the EPC ACK followed by RN16 stored in the

internal RN16 register during last successful Query command.

•

NAK (9Eh): the NAK command issues the EPC Gen2 NAK command to tags.

•

ReqRN (9Fh): the ReqRN command issues the EPC Request RN to the tag. The last

received RN is used as a parameter and the received new RN16 (handle) is stored in

the internal RN16 register for further communications (ACK, ReqRN). New RN16 is

also stored in the FIFO.

•

Automatic power supply level setting (A2h), manual power supply level setting

(A3h): these commands trigger the automatic adjustment of the on-board voltage

ST25RU3993 датащи(PDF) 21 Page - STMicroelectronics

ST25RU3993 датащи(HTML) 21 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

датащи скачать

ссылки URL