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ST25R3918 Datasheet(PDF) 18 Page - STMicroelectronics |
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ST25R3918 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 141 page  Description ST25R3918 18/141 DS13490 Rev 2 2.2.12 FIFO The ST25R3918 contains a 512-byte FIFO. Depending on the direction of the data transfer, it contains either data which has been received or data which is to be transmitted. In reader mode the ST25R3918 can transmit frames of up to 8191 bytes length and receive frames of arbitrary length. 2.2.13 Control logic The control logic contains I/O registers that define the operation of device. 2.2.14 Host interface A 4-wire serial peripheral interface (SPI) and a 2-wire I2C interface are available to communicate with an external microcontroller. The pins for the SPI and the I2C interface are shared, and pin I2C_EN is used to select the active interface. 2.2.15 Passive target memory The device contains a 48-byte RAM to store configuration data for the passive target and card emulation mode. 2.2.16 P2RAM The P2RAM stores information on wafer number, die position, device subversion, and I2C address. The P2RAM is programmed during production. |
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