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MFRC63002R Scheda tecnica(PDF) 59 Page - NXP Semiconductors |
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MFRC63002R Scheda tecnica(HTML) 59 Page - NXP Semiconductors |
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59 / 118 page  MFRC630 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.1 — 6 September 2012 227531 59 of 118 NXP Semiconductors MFRC630 Contactless reader IC Table 46. WaterLevel bits Bit Symbol Description 7 to 0 WaterLevel Sets a level to indicate a FIFO-buffer state which can be read from bits HighAlert and LowAlert in the FifoControl. In 512-bit FIFO mode, the register is extended by bit WaterLevel in the FIFOControl. This functionality can be used to avoid a FIFO buffer overflow or underflow: The bit HiAlert bit in FIFO Control is read logic 1, if the number of bytes in the FIFO-buffer is equal or less than the number defined by WaterLevel. The bit LoAlert bit in FIFO control is read logic 1, if the number of bytes in the FIFO buffer is equal or less than the number defined by WaterLevel. Note: For the calculation of HiAlert and LoAlert see register description of these bits (Section 9.4.1 “FIFOControl”). |
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