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README.md

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RC522

	RC522的原理

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	SPI:
	连线说明:
	1--CS  <----->PG7
	2--SCK <----->PB3
	3--MOSI<----->PB5
	4--MISO<----->PB4
	5--悬空
	6--GND <----->GND
	7--RST(CE) <----->PG6
	8--VCC <----->VCC

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