iFix RT809 Series, Manual

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4.12 S3F Series Samsung Singlechip’s Reading and Writing
S3F Series Samsung Singlechip is widely used in the kinds of small home appliances like induction
cooker,pressure-cooker and electric frying pan of Midea,Galanz,Povos and other brands.When it needs
to read and write the data or change the chip to do repairing,we can use RT809F to do the reading and
writing.
4.12.1 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).
4.12.2 Preparation

Reading and writing the S3F series MCU using RT809F need to purchase the ICSP port board used
by PIC series or DIY a port board to cooperate with RT809H.It need to connect 5 lines,which
respectively is VPP program voltage(12.5V),VDD power supply 5V,GND,SDA data signal and SCL
clock signal.

The users need to check the pin definition of MCU of certain version,and connect them with ICSP
port board correspondingly one by one.If there are online read&write port on the target
board,currently it can be connected directly and read or write on line.

Please remove the MCU and fly 5 lines to ICSP port board to read and write in the following
situation:

There is no reserved online read&write port on the board and VPP/RESET pin is used as
common IO,connected with other circuit;

After connecting on line with ICSP,VPP voltage is lowered to be less than 12V;

When reading or writing on line goes wrong with ICSP(Because S3F series programming
timing sequence require that VDD and VPP must both be controlled,but on some board card
this 2 pins’ capacitance is too big,which makes the timing sequence unqualified,removing
MCU,using socket or flying lines to read and write will avoid this problem)
4.12.3 Attention:

The first time to use ICSP port board,please insert the board on the RT809F locking socket and