It consists of 32 KB ISP flash memory with read-while-write capabilities, 2 KB SRAM(Static RAM), 1 KB of EEPROM, 23 general-purpose I/O pins, a 16MHz clock, 32 general purpose working registers, three flexible timer/counters with compare modes (two 8 bits and one 16 bit), internal and external interrupts, serial programmable UART, a byte-oriented I2C (inter-integrated circuit) interface pins, SPI serial port, 6-channel 10-bit Analog to Digital converter, programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The device operates between a voltage range of 1.8-5.5 volts.
Note: 328p in ATmega328p means: 32 for 32KB of flash memory, 8 for Bit RISC architecture(databus), and p for “pico-power” (consumes less power under certain circumstances)
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