ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 56
![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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Company
Part Number
Manufacturer
Quantity
Price
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10.10 Register Description
10.10.1
10.10.2
2549M–AVR–09/10
SMCR – Sleep Mode Control Register
PRR0 – Power Reduction Register 0
There are three alternative ways to disable the OCD system:
•
•
•
The Sleep Mode Control Register contains control bits for power management.
• Bits 3, 2, 1 – SM2:0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in
Table 10-2.
Note:
• Bit 1 – SE: Sleep Enable
The SE bit must be written to logic one to make the MCU enter the sleep mode when the SLEEP
instruction is executed. To avoid the MCU entering the sleep mode unless it is the programmer’s
purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the execution of
the SLEEP instruction and to clear it immediately after waking up.
• Bit 7 - PRTWI: Power Reduction TWI
Writing a logic one to this bit shuts down the TWI by stopping the clock to the module. When
waking up the TWI again, the TWI should be re initialized to ensure proper operation.
Bit
0x33 (0x53)
Read/Write
Initial Value
Bit
(0x64)
Read/Write
Initial Value
Disable the OCDEN Fuse.
Disable the JTAGEN Fuse.
Write one to the JTD bit in MCUCR.
SM2
0
0
0
0
1
1
1
1
1. Standby modes are only recommended for use with external crystals or resonators.
PRTWI
Sleep Mode Select
R/W
7
0
7
–
R
0
SM1
0
0
1
1
0
0
1
1
PRTIM2
R/W
6
0
6
–
R
0
ATmega640/1280/1281/2560/2561
PRTIM0
R/W
5
0
R
5
–
0
SM0
0
1
0
1
0
1
0
1
R
4
–
0
R
4
–
0
PRTIM1
R/W
3
0
SM2
R/W
3
0
PRSPI
R/W
2
0
ADC Noise Reduction
SM1
R/W
Extended Standby
2
0
Sleep Mode
Power-down
Power-save
Standby
Reserved
Reserved
PRUSART0
Idle
SM0
R/W
Table
R/W
1
0
1
0
(1)
10-2.
(1)
R/W
SE
PRADC
0
0
R/W
0
0
SMCR
PRR0
56
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