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STRFNFCA Datasheet(PDF) 11 Page - STMicroelectronics

Part # STRFNFCA
Description  Near field communication transceiver
Download  74 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STRFNFCA Datasheet(HTML) 11 Page - STMicroelectronics

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STRFNFCA
Communication protocols
Doc ID 023077 Rev 10
11/74
4
Communication protocols
4.1
Universal asynchronous receiver/transmitter (UART)
The host sends commands to the STRFNFCA and waits for replies. Polling for readiness is
not necessary. The default baud rate is 57600 baud. The maximum allowed baud rate is
2 Mbps.
When sending commands, no data must be sent if the LEN field is zero.
When receiving data from the STRFNFCA, no data will be received if the LEN field is zero.
The formats of send and receive packets are identical.
If an ECHO command is sent, only one byte (0x55) is sent by the host.
Figure 7 shows an example of an ECHO command.
Caution:
UART communication is LSB first. Stop bit duration is two Elementary Time Units
(ETUs).
Note:
1
When STRFNFCA leaves WFE mode (from Power-up, Hibernate, Sleep/Field Detector or
Tag Detector) following an |RQ_IN/RX low level pulse, this pulse is NOT interpreted as the
UART start bit character.
2
If the user loses UART synchronization, it can be recovered by sending an ECHO command
until a valid ECHO reply is received. Otherwise, after a maximum of 255 ECHO commands,
Figure 6.
UART communication
Figure 7.
ECHO command and response example
Sending commands to the STRFNFCA
Receiving data from the STRFNFCA
CMD
LEN
DATA
DATA
Several data bytes
Resp Code
LEN
DATA
DATA
Several data bytes
Ai18122
Int.
Clock
RX
TX
012
3
4567
10101010
1
(Stop)
(Echo 0x55)
Host to STRFNFCA
Rx
TX
STRFNFCA to Host
1
(Start)
10101010
1
(Stop)
(Echo 0x55)
1
(Start)


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