Reprogrammed with a high-voltage parallel or serial programmer, and via The flash program memory can be reprogrammed using a programming tool, the most popular being those that program the chip in situĪnd are called in-system programmers (ISP). Mechanisms like page banking or segment registers are not required toĬall any function, regardless of its location in program memory.ĪVRs cannot use external program memory the flash memory on the chip is the only program memory available to the AVR core. Program memory is linearly addressed, and so The program memory holds the executable program opcodesĪnd static data tables. Memory for program storage, from 1KB up to 256KB (or, 512-128K typical Program MemoryĪll AVR microcontrollers have some amount of 16 bit wide non-volatile flash Address 0 in data memory is distinct from address 0 in programįlash and address 0 in EEPROM.
Of memory is separated from each other, in different locations on theĬhip. Data memory: registers, I/O registers, and SRAMĪll these memories are on the same chip as the CPU core.The four types of memories in a Atmel AVR are: The AVR uses internal memory forĭata and program storage, and so does not require any external memory. In which the program and data memory are on separate buses to allowįaster access and increased capacity. The memory of the Atmel AVR processors is a Modified Harvard architecture, 13.3 Programming & Educational Websites.6.1 Universal Synchronous Asynchronous Receiver Transmitter (USART).