The size of program memory is specified in bytes, but it often is addressed as words. The second byte (0x53) will be echoed back by the MCU.The notation is being used to indicate that the 16-bit address (as formed by the central bytes of a Write Program Memory Page instruction) is the address of a program-memory word, rather than a program-memory byte. Wait for at least 20 ms and then the programming enable serial instruction 0xAC, 0x53, 0x00, 0x00 is sent to the MOSI pin. Power is applied to V CC while RESET and SCK are set to zero. Serial data to the MCU is clocked on the rising edge and data from the MCU is clocked on the falling edge. Set XA1:XA0:BS1:DATA = 100 1000 0000, pulse XTAL1 for at least 150 ns, pulse WR to zero. Programming mode is entered when PAGEL (PD7), XA1 (PD6), XA0 (PD5), BS1 (PD4) is set to zero.

High means the MCU is ready for a new command, otherwise busy.īyte select 1 ('0' = Low byte, '1' = High byte)īyte select 2 ('0' = low byte, '1' = 2nd high byte)īi-directional data bus (output when OE is low) Reliability qualification shows that the projected data retention failure rate is much less than 1 PPM over 20 years at 85 ☌ or 100 years at 25 ☌. Perhaps the most common implementation of this chip is on the popular Arduino development platform, namely the Arduino Uno, Arduino Pro Mini and Arduino Nano models. ATmega328PB and ATmega328PB-AUTOMOTIVE (superset of ATmega328P) - has more UART, I2C, and SPI peripherals than ATmega328PĪTmega328 is commonly used in many projects and autonomous systems where a simple, low-powered, low-cost micro-controller is needed.A comprehensive list of all other members of the megaAVR series can be found on the Atmel website. Features ParameterĪ common alternative to the ATmega328 is the 'picoPower' ATmega328P. The device achieves throughput approaching 1 MIPS/MHz. The device operates between 1.8 and 5.5 volts. The Atmel 8-bit AVR RISC-based microcontroller combines 32 KB ISP flash memory with read-while-write capabilities, 1 KB EEPROM, 2 KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, 3 flexible timer/ counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter (8 channels in TQFP and QFN/ MLF packages), programmable watchdog timer with internal oscillator, and 5 software-selectable power-saving modes.

It has a modified Harvard architecture 8-bit RISC processor core. The ATmega328 is a single- chip microcontroller created by Atmel in the megaAVR family (later Microchip Technology acquired Atmel in 2016).

Arduino uno atmega328p datasheet