The design of 915MHz band RFID frequency hopping system based on DSP and PL400 is introduced, and the control of DSP to PL400, frequency hopping channel allocation, frequency hopping pattern design and other issues are discussed. Wide interval frequency hopping and adaptive frequency control are realized, which enhances the security and stability of RFID reader. Keywords R F I D Frequency hopping D S P CLCC D N 7 4 T N 9 1 4 . 4 ; D I F I D Frequency hopping D S P CLCC D N 7 4 T N 9 1 4 . 4 ; D I F I D Network in 915MHz band has the hidden danger of information leakage such as wireless link being eavesdropped, counterfeited and tampered. Mobile phone communication in the same frequency band will also interfere with the communication between RFID reader and tag. Typical improvement methods include encryption mechanism, use of spread spectrum and frequency hopping technology. This paper proposes a 9.15 MHz R F I D s based on P L L 4 0 0 and D S P ……
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