AN2614

Embedding the serial number

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2.2

Getting the serial number from an external device

The serial number may be programmed in external memory, such as EEPROM. In this way,

the MCU software memory array and the EEPROM data array can be programmed in a

number of different ways:

●

By each device using its own respective programming tool

●

By the MCU receiving the serial number later (for example, through an SCI interface)

and then programming the EEPROM accordingly

The MCU must read the EEPROM upon reset (if the serial number is to be processed by it)

and must store the serial number in RAM, as follows:

char Serial_Number[4];

void main(void) {

//...

Read_EEPROM(Serial_Number, SubAddress);

// read string and store it into Serial_Number

In this way, the serial number is not permanently stored in the MCU and all MCUs in the

production lot can be programmed with exactly the same contents.