5
8021HS–AVR–07/2015
ATmega329P/3290P
resulting architecture is more code efficient while achieving throughputs up to ten times faster
than conventional CISC microcontrollers.
The ATmel
®
AVR
®
ATmega329P/3290P provides the following features: 32K bytes of In-System
Programmable Flash with Read-While-Write capabilities, 1Kbytes EEPROM, 2Kbyte SRAM,
54/69 general purpose I/O lines, 32 general purpose working registers, a JTAG interface for
Boundary-scan, On-chip Debugging support and programming, a complete On-chip LCD con-
troller with internal contrast control, three flexible Timer/Counters with compare modes, internal
and external interrupts, a serial programmable USART, Universal Serial Interface with Start
Condition Detector, an 8-channel, 10-bit ADC, a programmable Watchdog Timer with internal
Oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode
stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to con-
tinue 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 and the LCD controller continues to run, allowing the user to maintain a
timer base and operate the LCD display while the rest of the device is sleeping. The ADC Noise
Reduction mode stops the CPU and all I/O modules except asynchronous timer, LCD controller
and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crys-
tal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast
start-up combined with low-power consumption.
The device is manufactured using Atmel’s high density non-volatile memory technology. The
On-chip In-System re-Programmable (ISP) Flash allows the program memory to be repro-
grammed 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. Soft-
ware 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 ATmega329P/3290P is a powerful
microcontroller that provides a highly flexible and cost effective solution to many embedded con-
trol applications.
The ATmega329P/3290P AVR is supported with a full suite of program and system develop-
ment tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit
Emulators, and Evaluation kits.
2.2 Comparison between ATmega329P, and ATmega3290P.
The ATmega329P, and ATmega3290P differ only in pin count and pinout. Table 2-1 on page 5
summarizes the different configurations for the four devices.
Table 2-1. Configuration Summary
Device Flash EEPROM RAM
LCD
Segments
General Purpose
I/O Pins
ATmega329P 32Kbytes 1Kbytes 2Kbytes 4 x 25 54
ATmega3290P 32Kbytes 1Kbytes 2Kbytes 4 x 40 69
