ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 439
ATMEGA2561-16AI
Manufacturer Part Number
ATMEGA2561-16AI
Description
IC AVR MCU 256K 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA2561-16AI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
256KB (128K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Manufacturer
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Price
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2549M–AVR–09/10
19 8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 174
20 SPI – Serial Peripheral Interface ......................................................... 195
21 USART ................................................................................................... 205
22 USART in SPI Mode ............................................................................. 232
18.1
18.2
19.1
19.2
19.3
19.4
19.5
19.6
19.7
19.8
19.9
19.10
20.1
20.2
21.1
21.2
21.3
21.4
21.5
21.6
21.7
21.8
21.9
21.10
22.1
22.2
22.3
22.4
22.5
22.6
Overview ........................................................................................................172
Description .....................................................................................................172
Overview ........................................................................................................174
Timer/Counter Clock Sources .......................................................................175
Counter Unit ..................................................................................................175
Modes of Operation .......................................................................................176
Output Compare Unit .....................................................................................180
Compare Match Output Unit ..........................................................................182
Timer/Counter Timing Diagrams ...................................................................183
Asynchronous Operation of Timer/Counter2 .................................................184
Timer/Counter Prescaler ...............................................................................186
Register Description ......................................................................................187
SS Pin Functionality ......................................................................................200
Register Description ......................................................................................202
Features ........................................................................................................205
Clock Generation ...........................................................................................206
Frame Formats ..............................................................................................209
USART Initialization .......................................................................................210
Data Transmission – The USART Transmitter ..............................................212
Data Reception – The USART Receiver .......................................................214
Asynchronous Data Reception ......................................................................218
Multi-processor Communication Mode ..........................................................221
Register Description ......................................................................................222
Examples of Baud Rate Setting .....................................................................227
Overview ........................................................................................................232
USART MSPIM vs. SPI .................................................................................232
SPI Data Modes and Timing ..........................................................................233
Frame Formats ..............................................................................................234
Data Transfer .................................................................................................236
USART MSPIM Register Description ............................................................237
ATmega640/1280/1281/2560/2561
iv
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