SRTAG2KL datasheet(41/51 Pages) STMICROELECTRONICS

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SRTAG2KL

RF command sets

The SFGI which stands for the Start-up Frame Guard Time is the minimum time that the

reader shall wait after receiving the response of the SRTAG2KL.

5.9.3

PPS command & response(b)

PPS (Protocol and Parameter Selection) command and response are defined in ISO/IEC

14443-4, in the Protocol Activation of PICC Type A.

The PPS command allows to change the data rates of the ascending (RF host to

SRTAG2KL) and descending (SRTAG2KL to RF host) data rates. Usage of this command is

optional, SRTAG2KL only supports 106 Kb/s in both direction.

The ascending and descending data rates shall be coded as described in Table 52.

When the SRTAG2KL is able to change both data rates, it returns the following response.

The data rate of this response is 106 kbps; then, the SRTAG2KL changes the ascending

and descending data rates.

Table 53 gives the details sof the PPS response.

b. Not useful in case of SRTAG2KL which only support a Data Rate of 106 Kb/s in both direction.

Table 51. PPS command

Name

INS (PPSS)

PPS0

PPS1

CRC

Byte field

0xDX

0x11

1 byte

2 bytes

Bit field

b7-b4

b3-b0

0b0000

b3-b2

b1-b0

INS

Instruction code

DID

PPS1 is present

PPS1

RFU

Descending data rate (106 kb/s) = 0b00

Ascending data rate (106 kb/s) = 0b00

2 CRC bytes

Table 52. Ascending and descending data rate coding

Value

0b00

0b01

0b10

0b11

Data rate

106 kbps

RFU

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