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* Reading and writing MCU of PIC series on line using RT809F need to buy or DIY a ICSP port board according to the diagram to cooperate with RT809F; * There are totally 5 lines for the ICSP port,they are VPP program voltage(12V~13V),VDD power supply 5V,GND,PGD data signal and PGC clock signal. * Users need to check the pin definition of the PIC relevant type of MCU,and connect the pins with ICSP ports correspondingly one by one.If there are ICSP port on the target board,usually they can be connected directly and read or write on line. * Remove the PIC series of MCU and fly 5 lines to ICSP port to read and write in following situation : There is no reserved ICSP port on the board card, and VPP pin is used as common IO,connected with other chip,it’s the same for this example; After ICSP connecting on line,VPP voltage will be dropped down to be lower than 12V or VDD voltage will be dropped down to be lower than 4.6V; When reading and writing on line by ICSP goes wrong(Because the PIC series programming timing sequence require both VDD and VPP to be controlled,but these two pins on some board cards have the overlarge external capacitor,which makes the timing sequence unqualified,removing MCU,using socket or flying line to read and write won’t have the same problem .)