Clone MCU ATMEGA164V Eeprom

We can Clone MCU ATMEGA164V Eeprom, please view the MCU ATMEGA164V features for your reference:

When the External Memory is enabled, all Port C pins are default used for the high address byte. If the full 60KB address space is not required to access the External Memory, some, or all, Port C pins can be released for normal Port Pin function when clone mcu eeprom.

As described in “Using all 64KB Locations of External Memory” on page 36, it is possible to use the XMMn bits to access all 64KB locations of the External Memory if clone mcu eeprom.

Since the external memory is mapped after the internal memory as shown in Figure 14, the external memory is not addressed when addressing the first 8,704 bytes of data space. It may appear that the first 8,704 bytes of the external memory are inaccessible (external memory addresses 0x0000 to 0x21FF) before clone mcu eeprom.

However, when connecting an external memory smaller than 64 KB, for example 32 KB, these locations are easily accessed simply by addressing from address 0x8000 to 0xA1FF. Since the External Memory Address bit A15 is not connected to the external memory, addresses 0x8000 to 0xA1FF will appear as addresses 0x0000 to 0x21FF for the external memory after clone mcu eeprom.

Addressing above address 0xA1FF is not recommended, since this will address an external memory location that is already accessed by another (lower) address when clone mcu eeprom.

To the Application software, the external 32 KB memory will appear as one linear 32 KB address space from 0x2200 to 0xA1FF. Since the External Memory is mapped after the Internal Memory as shown in Figure 14, only 56KB of External Memory is available by default (address space 0x0000 to 0x21FF is reserved for internal memory) if clone mcu eeprom.

However, it is possible to take advantage of the entire External Memory by masking the higher address bits to zero. This can be done by using the XMMn bits and control by software the most significant bits of the address before clone mcu eeprom.

By setting Port C to output 0x00, and releasing the most significant bits for normal Port Pin operation, the Memory Interface will address 0x0000 – 0x2FFF. See the following code examples. Care must be exercised using this option as most of the memory is masked away after clone mcu eeprom.


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