ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 114
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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14.2.2
2549M–AVR–09/10
EICRB – External Interrupt Control Register B
Table 14-1.
Note:
Table 14-2.
• Bits 7:0 – ISC71, ISC70 - ISC41, ISC40: External Interrupt 7 - 4 Sense Control Bits
The External Interrupts 7 - 4 are activated by the external pins INT7:4 if the SREG I-flag and the
corresponding interrupt mask in the EIMSK is set. The level and edges on the external pins that
activate the interrupts are defined in
before detecting edges. If edge or toggle interrupt is selected, pulses that last longer than one
clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an inter-
rupt. Observe that CPU clock frequency can be lower than the XTAL frequency if the XTAL
divider is enabled. If low level interrupt is selected, the low level must be held until the comple-
tion of the currently executing instruction to generate an interrupt. If enabled, a level triggered
interrupt will generate an interrupt request as long as the pin is held low.
Table 14-3.
Note:
Bit
(0x6A)
Read/Write
Initial Value
ISCn1
ISCn1
Symbol
t
0
0
1
1
0
0
1
1
INT
1. n = 3, 2, 1or 0.
1. n = 7, 6, 5 or 4.
ISCn0
When changing the ISCn1/ISCn0 bits, the interrupt must be disabled by clearing its Interrupt
Enable bit in the EIMSK Register. Otherwise an interrupt can occur when the bits are changed.
When changing the ISCn1/ISCn0 bits, the interrupt must be disabled by clearing its Interrupt
Enable bit in the EIMSK Register. Otherwise an interrupt can occur when the bits are changed.
ISCn0
Minimum pulse width for asynchronous
0
1
0
1
0
1
0
1
Asynchronous External Interrupt Characteristics
Interrupt Sense Control
Interrupt Sense Control
ISC71
R/W
7
0
The falling edge between two samples of INTn generates an interrupt request.
The rising edge between two samples of INTn generates an interrupt request.
external interrupt
ISC70
The falling edge of INTn generates asynchronously an interrupt request.
The rising edge of INTn generates asynchronously an interrupt request.
R/W
Parameter
6
0
Any edge of INTn generates asynchronously an interrupt request.
Any logical change on INTn generates an interrupt request
ATmega640/1280/1281/2560/2561
The low level of INTn generates an interrupt request.
ISC61
The low level of INTn generates an interrupt request.
R/W
5
0
(1)
Table
(1)
ISC60
R/W
4
0
14-3. The value on the INT7:4 pins are sampled
Description
ISC51
Description
R/W
Condition
3
0
ISC50
R/W
2
0
Min
ISC41
R/W
1
0
Typ
50
ISC40
R/W
0
0
Max
EICRB
Units
ns
114
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