ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 434
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-20AU
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
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8011O–AVR–07/10
15 SPI – Serial Peripheral Interface ......................................................... 161
16 USART ................................................................................................... 171
17 USART in SPI Mode ............................................................................. 198
14.5 Output Compare Unit .........................................................................................141
14.6 Compare Match Output Unit ...............................................................................143
14.7 Modes of Operation ............................................................................................144
14.8 Timer/Counter Timing Diagrams ........................................................................148
14.9 Asynchronous Operation of Timer/Counter2 ......................................................150
14.10 Timer/Counter Prescaler ..................................................................................152
14.11 Register Description .........................................................................................152
15.1 Features .............................................................................................................161
15.2 Overview ............................................................................................................161
15.3 SS Pin Functionality ...........................................................................................166
15.4 Data Modes ........................................................................................................166
15.5 Register Description ...........................................................................................168
16.1 Features .............................................................................................................171
16.2 USART1 and USART0 .......................................................................................171
16.3 Overview ............................................................................................................171
16.4 Clock Generation ................................................................................................172
16.5 Frame Formats ...................................................................................................175
16.6 USART Initialization ...........................................................................................176
16.7 Data Transmission – The USART Transmitter ...................................................177
16.8 Data Reception – The USART Receiver ............................................................180
16.9 Asynchronous Data Reception ...........................................................................184
16.10 Multi-processor Communication Mode .............................................................187
16.11 Register Description .........................................................................................189
16.12 Examples of Baud Rate Setting .......................................................................194
17.1 Features .............................................................................................................198
17.2 Overview ............................................................................................................198
17.3 Clock Generation ................................................................................................198
17.4 SPI Data Modes and Timing ..............................................................................199
17.5 Frame Formats ...................................................................................................199
17.6 Data Transfer .....................................................................................................201
17.7 AVR USART MSPIM vs. AVR SPI .....................................................................203
17.8 Register Description ...........................................................................................204
ATmega164P/324P/644P
iv
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