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STRFNFCA Datasheet(PDF) 11 Page - STMicroelectronics |
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STRFNFCA Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 74 page 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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