ATmega644PA datasheet(6/468 Pages) ATMEL

6 / 468 page

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

The ATmega164PA/324PA/644PA/1284P provides the following features: 16/32/64/128K bytes

of In-System Programmable Flash with Read-While-Write capabilities, 512B/1K/2K/4K bytes

EEPROM, 1/2/4/16K/ bytes SRAM, 32 general purpose I/O lines, 32 general purpose working

registers, Real Time Counter (RTC), three flexible Timer/Counters with compare modes and

PWM, 2 USARTs, a byte oriented 2-wire Serial Interface, a 8-channel, 10-bit ADC with optional

differential input stage with programmable gain, programmable Watchdog Timer with Internal

Oscillator, an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface, also used for

accessing the On-chip Debug system and programming and six software selectable power sav-

ing modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, 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 main-

tain 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 consump-

tion. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue

to run.

The device is manufactured using Atmel’s high-density nonvolatile memory technology. The On-

chip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial

interface, by a conventional nonvolatile 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 ATmega164PA/324PA/644PA/1284P is a powerful microcontroller that provides a

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

The ATmega164PA/324PA/644PA/1284P AVR is supported with a full suite of program and sys-

te m de velop m e n t to ols in clud in g: C c o m p ilers , m a cr o asse mb lers, p r og ra m

debugger/simulators, in-circuit emulators, and evaluation kits.

2.2

Comparison Between ATmega164PA, ATmega324PA, ATmega644PA and ATmega1284P

Table 2-1.

Differences between ATmega164PA, ATmega324PA and ATmega644PA and

ATmega1284P

Device

Flash

EEPROM

RAM

ATmega164PA

16 Kbyte

512 Bytes

1 Kbyte

ATmega324PA

32 Kbyte

1 Kbyte

2 Kbyte

ATmega644PA

64 Kbyte

2 Kbyte

4 Kbyte

ATmega1284P

128 Kbyte

4 Kbyte

16 Kbyte

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