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ATMEGA3290P Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. ATMEGA3290P
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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5
8021AS–AVR–12/06
ATmega329P/3290P
The ATmega329P/3290P provides the following features: 32K bytes of In-System Programma-
ble Flash with Read-While-Write capabilities, 1K bytes EEPROM, 2K byte 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 controller with internal
contrast control, three flexible Timer/Counters with compare modes, internal and external inter-
rupts, 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 continue function-
ing. 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 asyn-
chronous 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 differs 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
32K bytes
1K bytes
2K bytes
4 x 25
54
ATmega3290P
32K bytes
1K bytes
2K bytes
4 x 40
69




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