ATmega325P datasheet(5/364 Pages) ATMEL

5 / 364 page

8023F–AVR–07/09

ATmega325P/3250P

The ATmega325P/3250P 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, three flexible Timer/Counters with compare

modes, internal and external interrupts, a serial programmable USART, Universal Serial Inter-

face 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 sys-

tem 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, 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.

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 ATmega325P/3250P is a powerful

microcontroller that provides a highly flexible and cost effective solution to many embedded con-

trol applications.

The ATmega325P/3250P 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 ATmega325P and ATmega3250P

The ATmega325P and ATmega3250P differs only in memory sizes, 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

General Purpose

I/O Pins

ATmega325P

32K bytes

1K bytes

2K bytes

ATmega3250P

32K bytes

1K bytes

2K bytes

ATmega325P датащи(PDF) 5 Page - ATMEL Corporation

ATmega325P датащи(HTML) 5 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL