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The Atmel AT89 series is an Intel 8051-compatible family of 8 bit microcontrollers -LRB- µCs -RRB- manufactured by the Atmel Corporation .. Intel 8051. Intel 8051. Atmel Corporation. Atmel. Based on the Intel 8051 core , the AT89 series remains very popular as general purpose microcontrollers , due to their industry standard instruction set , their low unit cost , and the availability of these chips in DIL -LRB- DIP -RRB- packages .. Intel 8051. Intel 8051. This allows a great amount of legacy code to be reused without modification in new applications .. While less powerful than the newer AT90 series of AVR RISC microcontrollers , new product development has continued with the AT89 series for the aforementioned advantages .. AVR. Atmel AVR. RISC. RISC. More recently , the AT89 series has been augmented with 8051-cored special function microcontrollers , specifically in the areas of USB , I ² C -LRB- two wire interface -RRB- , SPI and CAN bus controllers , MP3 decoders and hardware PWM .. USB. Universal Serial Bus. SPI. Serial Peripheral Interface. CAN. Controller Area Network. MP3. MP3. PWM. Pulse-width modulation. Atmel has also created an LP -LRB- low power -RRB- series of these chips with a `` Single Cycle Core '' , making the execution speed of these chips considerably faster .