This functionality is used mainly by bootloaders.ĭata Memory includes the registers, the I/O registers, and internal SRAM. Many of the newer AVRs (MegaAVR series) have the capability to self-program the flash memory. The flash memory in an AVR can be re-programmed at least 10,000 times. Atmel AVRs can also be reprogrammed with a high-voltage parallel or serial programmer, and via JTAG (again, in situ) on certain chips. The flash program memory can be reprogrammed using a programming tool, the most popular being those that program the chip in situ and are called in-system programmers (ISP). SRAM is very expensive, 4) SRAM is a volatile memory type, which means that when the powerĬonnection is lost all the data within an SRAM will be lost as well. Power consumption is very large, 3) Because of high component requirement and power cost, 1) It requires 4-6 transistor to store oneīit, which makes SRAM space-inefficient, 2) Because of high component requirement, SRAM’s SRAM is very fast however, it has many disadvantages. Unlike dynamic RAM (DRAM), which stores bits in cells consisting of a capacitor and a transistor, SRAM does not have to be periodically refreshed. SRAM (static RAM) is random access memory (RAM) that retains data bits in its memory as long as power is being supplied. Program memory is linearly addressed, and so mechanisms like page banking or segment registers are not required to call 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. The program memory holds the executable program opcodes and static data tables. Some AVR microcontrollers have 16 bit wide non-volatile and some have 8 bit flash memory for program storage, from 1 KB up to 256 KB (or, 512-128K typical program words). Address 0 in data memory is distinct from address 0 in program flash and address 0 in EEPROM.
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