6

8272AS–AVR–01/10

164A/164PA/324A/324PA/644A/644PA/1284/1284P

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 gen-

eral 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 select-

able power saving 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 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/Reso-

nator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up

combined with low power consumption. 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 ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P is a powerful microcon-

troller that provides a highly flexible and cost effective solution to many embedded control

applications.

The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P AVR is supported with a full

suite of program and system development tools including: C compilers, macro assemblers, pro-

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

2.2

Comparison Between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA,

ATmega644A, ATmega644PA, ATmega1284 and ATmega1284P

Table 2-1.

Differences between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA, ATmega644A,

ATmega644PA, ATmega1284 and ATmega1284P

Device

Flash

EEPROM

RAM

Units

ATmega164A

16 K

512

1 K

bytes

ATmega164PA

16 K

512

1 K

ATmega324A

32 K

1 K

2 K

ATmega324PA

32 K

1 K

2 K

ATmega644A

64 K

2 K

4 K

ATmega644PA

64 K

2 K

4 K

ATmega1284

128 K

4 K

16 K

ATmega1284P

128 K

4 K

16 K