ST25TA64K datasheet(36/45 Pages) STMICROELECTRONICS

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RF command sets

ST25TA64K

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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 ST25TA64K.

5.9.3

PPS command & response

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

ST25TA64K) and descending (ST25TA64K to RF host) data rates.

The ascending and descending data rates shall be coded as described in Table 49.

When the ST25TA64K is able to change both data rates, it returns the following response.

The data rate of this response is 106 kbps; then, the ST25TA64K changes the ascending

and descending data rates.

Table 50 gives the details of the PPS response.

Table 48. PPS command

Name

INS

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

Ascending data rate

2 CRC bytes

Table 49. Ascending and descending data rate coding

Value

0b00

0b01

0b10

0b11

Data rate

106 kbps

RFU

Table 50. PPS response

Name

INS

PPS0

Byte field

0xDX

0x11

Bit field

b8-b5

b4-b1

Response code

DID field

2 CRC bytes

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