ATMEGA644A-AU Atmel, ATMEGA644A-AU Datasheet - Page 576
![IC MCU AVR 64K FLASH 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644A-AU
Manufacturer Part Number
ATMEGA644A-AU
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA644A-AU
Manufacturer:
Atmel
Quantity:
135
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8272A–AVR–01/10
17 SPI – Serial Peripheral Interface ......................................................... 162
18 USART ................................................................................................... 172
19 USART in SPI Mode ............................................................................. 199
20 2-wire Serial Interface .......................................................................... 208
164A/164PA/324A/324PA/644A/644PA/1284/1284P
16.7Modes of Operation .............................................................................................145
16.8Timer/Counter Timing Diagrams .........................................................................149
16.9Asynchronous Operation of Timer/Counter2 .......................................................151
16.10Timer/Counter Prescaler ...................................................................................153
16.11Register Description ..........................................................................................154
17.1Features ..............................................................................................................162
17.2Overview .............................................................................................................162
17.3SS Pin Functionality ............................................................................................167
17.4Data Modes .........................................................................................................167
17.5Register Description ............................................................................................169
18.1Features ..............................................................................................................172
18.2USART1 and USART0 ........................................................................................172
18.3Overview .............................................................................................................172
18.4Clock Generation .................................................................................................173
18.5Frame Formats ....................................................................................................176
18.6USART Initialization ............................................................................................177
18.7Data Transmission – The USART Transmitter ....................................................178
18.8Data Reception – The USART Receiver .............................................................181
18.9Asynchronous Data Reception ............................................................................185
18.10Multi-processor Communication Mode ..............................................................188
18.11Register Description ..........................................................................................190
18.12Examples of Baud Rate Setting ........................................................................195
19.1Features ..............................................................................................................199
19.2Overview .............................................................................................................199
19.3Clock Generation .................................................................................................199
19.4SPI Data Modes and Timing ...............................................................................200
19.5Frame Formats ....................................................................................................200
19.6Data Transfer ......................................................................................................202
19.7AVR USART MSPIM vs. AVR SPI ......................................................................204
19.8Register Description ............................................................................................205
20.1Features ..............................................................................................................208
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