ATMEGA328P-20AU datasheet(7/420 Pages) ATMEL

Part #	ATMEGA328P-20AU

Description	8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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8025M–AVR–6/11

ATmega48P/88P/168P

2.2

Comparison Between ATmega48P, ATmega88P and ATmega168P

The ATmega48P, ATmega88P and ATmega168P differ only in memory sizes, boot loader sup-

port, and interrupt vector sizes. Table 2-1 summarizes the different memory and interrupt vector

sizes for the three devices.

ATmega88P and ATmega168P support a real Read-While-Write Self-Programming mechanism.

There is a separate Boot Loader Section, and the SPM instruction can only execute from there.

In ATmega48P, there is no Read-While-Write support and no separate Boot Loader Section.

The SPM instruction can execute from the entire Flash.

Table 2-1.

Memory Size Summary

Device

Flash

EEPROM

RAM

Interrupt Vector Size

ATmega48P

4KBytes

256Bytes

512Bytes

1 instruction word/vector

ATmega88P

8KBytes

512Bytes

1KBytes

1 instruction word/vector

ATmega168P

16KBytes

512Bytes

1KBytes

2 instruction words/vector

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