ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 187
![IC AVR MCU 256K 16MHZ 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
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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Part Number
Manufacturer
Quantity
Price
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19.10 Register Description
19.10.1
2549M–AVR–09/10
TCCR2A –Timer/Counter Control Register A
• Bits 7:6 – COM2A1:0: Compare Match Output A Mode
These bits control the Output Compare pin (OC2A) behavior. If one or both of the COM2A1:0
bits are set, the OC2A output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OC2A pin
must be set in order to enable the output driver.
When OC2A is connected to the pin, the function of the COM2A1:0 bits depends on the
WGM22:0 bit setting.
are set to a normal or CTC mode (non-PWM).
Table 19-2.
Table 19-3
mode.
Table 19-3.
Note:
Table 19-4 on page 188
to phase correct PWM mode.
Bit
(0xB0)
Read/Write
Initial Value
COM2A1
COM2A1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR2A equals TOP and COM2A1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at BOTTOM. See
page 178
shows the COM2A1:0 bit functionality when the WGM21:0 bits are set to fast PWM
Compare Output Mode, non-PWM Mode
Compare Output Mode, Fast PWM Mode
COM2A1
R/W
COM2A0
COM2A0
7
0
for more details.
0
1
0
1
0
1
0
1
Table 19-2
COM2A0
shows the COM2A1:0 bit functionality when the WGM22:0 bits are set
R/W
6
0
ATmega640/1280/1281/2560/2561
shows the COM2A1:0 bit functionality when the WGM22:0 bits
COM2B1
R/W
WGM22 = 0: Normal Port Operation, OC2A Disconnected.
5
0
Clear OC2A on Compare Match, set OC2A at BOTTOM
Set OC2A on Compare Match, clear OC2A at BOTTOM
WGM22 = 1: Toggle OC2A on Compare Match.
Normal port operation, OC2A disconnected.
Normal port operation, OC2A disconnected.
COM2B0
R/W
4
0
Toggle OC2A on Compare Match.
Clear OC2A on Compare Match.
Set OC2A on Compare Match.
(non-inverting mode).
(inverting mode).
R
3
–
0
(1)
Description
Description
R
2
0
–
WGM21
R/W
1
0
“Fast PWM Mode” on
WGM20
R/W
0
0
TCCR2A
187
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