Atmega 8 bit avr microcontrollers atmel atmega48a au the high performance atmel 8 bit avr risc based microcontroller combines 4kb isp flash memory 256 byte eeprom 512 byte sram 23 general purpose io lines 32 general purpose working registers three flexible timercounters with compare modes internal and external interrupts serial programmable usart a byte oriented 2 wire serial interface spi serial port 6 channel 10 bit ad converter 8 channels in tqfp and qfnmlf packages program