ATMEGA644-20PU Atmel, ATMEGA644-20PU Datasheet - Page 371
![IC AVR MCU FLASH 64K 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA644-20PU
Manufacturer Part Number
ATMEGA644-20PU
Description
IC AVR MCU FLASH 64K 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644-20PU
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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Processor Series
ATMEGA64x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
2-Wire/SPI/USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRRZ541, ATAVRRAVEN, ATAVRRZRAVEN, ATAVRRZUSBSTICK, ATAVRRZ201
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Controller Family/series
AVR MEGA
No. Of I/o's
32
Eeprom Memory Size
2KB
Ram Memory Size
4KB
Cpu Speed
20MHz
No. Of Timers
3
Rohs Compliant
Yes
Package
40PDIP
Device Core
AVR
Family Name
ATmega
Maximum Speed
20 MHz
For Use With
ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA644-20PU
Manufacturer:
Atmel
Quantity:
1 930
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2593N–AVR–07/10
15 8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 134
16 SPI – Serial Peripheral Interface ......................................................... 155
17 USART ................................................................................................... 164
18 USART in SPI Mode ............................................................................. 191
14.3Timer/Counter Clock Sources .............................................................................111
14.4Counter Unit ........................................................................................................112
14.5Input Capture Unit ...............................................................................................113
14.6Output Compare Units .........................................................................................115
14.7Compare Match Output Unit ................................................................................117
14.8Modes of Operation .............................................................................................118
14.9Timer/Counter Timing Diagrams .........................................................................125
14.1016-bit Timer/Counter Register Description ........................................................127
15.1Overview .............................................................................................................134
15.2Timer/Counter Clock Sources .............................................................................135
15.3Counter Unit ........................................................................................................135
15.4Output Compare Unit ..........................................................................................136
15.5Compare Match Output Unit ................................................................................138
15.6Modes of Operation .............................................................................................139
15.7Timer/Counter Timing Diagrams .........................................................................143
15.88-bit Timer/Counter Register Description ............................................................145
15.9Asynchronous operation of the Timer/Counter ....................................................150
15.10Timer/Counter Prescaler ...................................................................................154
16.1SS Pin Functionality ............................................................................................160
16.2Data Modes .........................................................................................................162
17.1USART0 ..............................................................................................................164
17.2Overview .............................................................................................................164
17.3Clock Generation .................................................................................................165
17.4Frame Formats ....................................................................................................168
17.5USART Initialization ............................................................................................169
17.6Data Transmission – The USART Transmitter ....................................................170
17.7Data Reception – The USART Receiver .............................................................173
17.8Asynchronous Data Reception ............................................................................177
17.9Multi-processor Communication Mode ................................................................180
17.10USART Register Description .............................................................................181
17.11Examples of Baud Rate Setting ........................................................................187
ATmega644
iii
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