4- Memory sorts

1. FLASH EEPROM - in system programmable flash EEPROM
2. byte addressable EEPROM
3. SRAM - static random access memory
4. Programmable lock bits

• in system programmable flash EEPROM:

a non-volatile memory, you will save your program in

• byte addressable EEPROM:

its a non-volatile memory , you can edit data during program execution
applications:

1. logging system malfunctions
2. saving system settings
3. electronic lock combinations ,...

atmega16 is equipped with 512 bytes of EEPROM

• SRAM : Static random access memory

a volatile memory , it will lose data as power get lost
Applications:

1. IO (input and output) registers
2. controlling peripheral subsystems
3. support dynamic data allocation of variables
4. a location for stack (discussed later)

• Programmable lock bits

there are six bits of memory that you can program them using programmer . you have the following options

1. No memory lock features enabled.
2. No further programming of memory is allowed using parallel or serial programming
   techniques.
3. No further programming or verification of memory is allowed using parallel or serial
   programming techniques.