iFix RT809F - Page 63

because of the static or so on.MCU need to be changed when repairing and then write the program
and data in again.
4.14.3 Program Data Source
 The original program and data supplied by after sale;
 The MCU program and data read by self(The precondition is that the MCU hasn’t been encrypted
and after reading the RT809F software will ask automatically if to encrypt or not;if the data has
been encrypted,the writing is unnecessary.)
 Decrypt the cryptographic MCU to get the program data(If it’s worthy to do according to its
value and the cost to decode).
4.14.4 Preparing
 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 .)
4.14.5 Attention
 The internal storage space inside PIC series MCU is divided into Code Memory program area,Data
Memory data area and Configuration Word / Calibration Word configuration area,the program