7

ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271IS-AVR- ATmega-Datasheet_10/2014

The ATmega48A/PA/88A/PA/168A/PA/328/P provides the following features: 4K/8Kbytes of In-System

Programmable Flash with Read-While-Write capabilities, 256/512/512/1Kbytes EEPROM, 512/1K/1K/2Kbytes

SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with

compare modes, internal and external interrupts, a serial programmable USART, a byte-oriented 2-wire Serial

Interface, an SPI serial port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a

programmable Watchdog Timer with internal Oscillator, and five software selectable power saving modes. The

Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire Serial Interface, SPI port,

and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the

Oscillator, disabling all other chip functions until the next interrupt or hardware reset. In Power-save mode, the

asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is

sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and

ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is

running while the rest of the device is sleeping. This allows very fast start-up combined with low power

consumption.

unambiguous detection of key events. The easy-to-use QTouch Suite toolchain allows you to explore, develop

and debug your own touch applications.

The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP Flash

allows the program memory to be reprogrammed In-System through an SPI serial interface, by a conventional

non-volatile memory programmer, or by an On-chip Boot program running on the AVR core. The Boot program

can use any interface to download the application program in the Application Flash memory. Software in the

Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-

While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a

monolithic chip, the Atmel ATmega48A/PA/88A/PA/168A/PA/328/P is a powerful microcontroller that provides a

highly flexible and cost effective solution to many embedded control applications.

The ATmega48A/PA/88A/PA/168A/PA/328/P AVR is supported with a full suite of program and system

development tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit

Emulators, and Evaluation kits.

2.2

Comparison Between Processors

The ATmega48A/PA/88A/PA/168A/PA/328/P differ only in memory sizes, boot loader support, and interrupt

vector sizes. Table 2-1 summarizes the different memory and interrupt vector sizes for the devices.

Table 2-1.

Memory Size Summary

Device

Flash

EEPROM

RAM

Interrupt Vector Size

ATmega48A

4KBytes

256Bytes

512Bytes

1 instruction word/vector

ATmega48PA

4KBytes

256Bytes

512Bytes

1 instruction word/vector

ATmega88A

8KBytes

512Bytes

1KBytes

1 instruction word/vector

ATmega88PA

8KBytes

512Bytes

1KBytes

1 instruction word/vector

ATmega168A

16KBytes

512Bytes

1KBytes

2 instruction words/vector

ATmega168PA

16KBytes

512Bytes

1KBytes

2 instruction words/vector

ATmega328

32KBytes

1KBytes

2KBytes

2 instruction words/vector

ATmega328P

32KBytes

1KBytes

2KBytes

2 instruction words/vector