What is the difference in method between accessing data from the EEPROM data registers and accessing data from the special function and normal registers?
Answer Accessing data from the special function registers is done using direct addressing. Accessing data from the normal registers can also use direct addressing or by using the memory pointers, MP0 and MP1, can use an indirect addressing method. For the EEPROM data registers, accessing data is different from the above two methods. This requires using the Bank 1 EECR register to execute indirect addressing. Accessing the EEPROM data register using the EECR register to write data, the transfer of which is conducted on a 3-line interface. The instructions used include the following seven: READ, ERASE, WRITE, EWEN, EWDS, ERAL and WRAL. For further details regarding these seven instructions consult the relevant specification.
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