ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 163
![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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Manufacturer
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16.11.15 TCNT4H and TCNT4L –Timer/Counter 4
16.11.16 TCNT5H and TCNT5L –Timer/Counter 5
16.11.17 OCR1AH and OCR1AL – Output Compare Register 1 A
16.11.18 OCR1BH and OCR1BL – Output Compare Register 1 B
16.11.19 OCR1CH and OCR1CL – Output Compare Register 1 C
2549M–AVR–09/10
The two Timer/Counter I/O locations (TCNTnH and TCNTnL, combined TCNTn) give direct
access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To
ensure that both the high and low bytes are read and written simultaneously when the CPU
accesses these registers, the access is performed using an 8-bit temporary High Byte Register
(TEMP). This temporary register is shared by all the other 16-bit registers.
Registers” on page 138.
Modifying the counter (TCNTn) while the counter is running introduces a risk of missing a com-
pare match between TCNTn and one of the OCRnx Registers.
Writing to the TCNTn Register blocks (removes) the compare match on the following timer clock
for all compare units.
Bit
(0xA5)
(0xA4)
Read/Write
Initial Value
Bit
(0x125)
(0x124)
Read/Write
Initial Value
Bit
(0x89)
(0x88)
Read/Write
Initial Value
Bit
(0x8B)
(0x8A)
Read/Write
Initial Value
Bit
(0x8D)
(0x8C)
Read/Write
Initial Value
R/W
R/W
R/W
R/W
R/W
7
0
7
0
7
0
7
0
7
0
R/W
R/W
R/W
R/W
R/W
6
0
6
0
6
0
6
0
6
0
ATmega640/1280/1281/2560/2561
R/W
R/W
R/W
R/W
R/W
5
0
5
0
5
0
5
0
5
0
R/W
R/W
R/W
R/W
R/W
4
0
4
0
4
0
4
0
4
0
OCR1A[15:8]
OCR1B[15:8]
OCR1C[15:8]
TCNT4[15:8]
TCNT5[15:8]
OCR1A[7:0]
OCR1B[7:0]
OCR1C[7:0]
TCNT4[7:0]
TCNT5[7:0]
R/W
R/W
R/W
R/W
R/W
3
0
3
0
3
0
3
0
3
0
R/W
R/W
R/W
R/W
R/W
2
0
2
0
2
0
2
0
2
0
R/W
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
1
0
See “Accessing 16-bit
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
OCR1AH
OCR1BH
OCR1CH
OCR1AL
OCR1BL
OCR1CL
TCNT4H
TCNT4L
TCNT5H
TCNT5L
163
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