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ST25DV04KC Datasheet(PDF) 78 Page - STMicroelectronics |
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ST25DV04KC Datasheet(HTML) 78 Page - STMicroelectronics |
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78 / 203 page  7.4 RF protocol description 7.4.1 Protocol description The transmission protocol (or simply “the protocol”) defines the mechanism used to exchange instructions and data between the VCD (Vicinity Coupling Device) and the ST25DVxxKC in both directions. It is based on the concept of “VCD talks first”. This means that a ST25DVxxKC does not start transmitting unless it has received and properly decoded an instruction sent by the VCD. The protocol is based on an exchange of: • a request from the VCD to the ST25DVxxKC, • a response from the ST25DVxxKC to the VCD. Each request and each response are contained in a frame. The frame are delimited by a Start of Frame (SOF) and End of Frame (EOF). The protocol is bit-oriented. The number of bits transmitted in a frame is a multiple of eight (8), that is an integer number of bytes. A single-byte field is transmitted least significant bit (LSBit) first. A multiple-byte field is transmitted least significant byte (LSByte) first and each byte is transmitted least significant bit (LSBit) first. Figure 38. ST25DVxxKC protocol timing Request frame Request frame Response frame Response frame VCD ST25DVxxKC Timing t1 t2 t1 t2 7.4.2 ST25DVxxKC states referring to RF protocol The ST25DVxxKC can be in one of four states: • Power-off • Ready • Quiet • Selected Transitions between these states are specified in Figure 39. ST25DVxxKC state transition diagram and Table 95. ST25DVxxKC response depending on Request_flags. Power-off state The ST25DVxxKC is in the Power-off state when it does not receive enough energy from the VCD. Ready state The ST25DVxxKC is in the Ready state when it receives enough energy from the VCD. When in the Ready state, the ST25DVxxKC answers any request where the Select_flag is not set. ST25DV04KC ST25DV16KC ST25DV64KC RF protocol description DS13519 - Rev 3 page 78/203 |
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