M24SR02-Y Datasheet, PDF (54/90 Pages) STMicroelectronics – Support of NDEF data structure

I²C and RF command sets
M24SR02-Y
5.9.3
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 M24SR02-Y.
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 M24SR02-
Y) and descending (M24SR02-Y to RF host) data rates.
Name
Table 62. PPS command
INS
PPS0
- Byte field
0xDX
0x11
Bit field b7-b4
Instruction code
INS
DID
PPS1 is present
RFU
PPS1 Descending data rate
Ascending data rate
2 CRC bytes
b3-b0
0b0000
PPS1
1 byte
b3-b2
b1-b0
CRC
2 bytes
The ascending and descending data rates shall be coded as described in Table 63.
Value
Data rate
Table 63. Ascending and descending data rate coding
0b00
0b01
0b10
106 kbps
RFU
RFU
0b11
RFU
When the M24SR02-Y is able to change both data rates, it returns the following response.
The data rate of this response is 106 kbps; then, the M24SR02-Y changes the ascending
and descending data rates.
Table 64 gives the details of the PPS response.
Name
Byte field
Bit field
Response code
DID field
2 CRC bytes
Table 64. PPS response
INS
-
0xDX
-
b8-b5
b4-b1
PPS0
0x11
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