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How many bits is ATtiny85?
ATtiny (also known as TinyAVR) are a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips.
How many external interrupts are in ATmega328P?
The ATmega 328P supports two external interrupts which are individually enabled by setting bits INT1 and INT0 in the External Interrupt Mask Register (Section 12.2.
How many external interrupts are on the ATmega2560?
eight external interrupt sources
Port pins in ATmega2560 Interrupt definitions The eight external interrupt sources (INT7:0) have dedicated interrupt vectors where a group of pin change interrupts share the same interrupt vector as listed in Table 1-1 External Interrupt Vector Address.
What do external interrupts do?
An external interrupt is a computer system interrupt that happens as a result of outside interference, whether that’s from the user, from peripherals, from other hardware devices or through a network.
How does an AVR attiny85 react to external interrupts?
This example code and simple wiring demonstrated how to setup an AVR ATtiny85 processor to react to external interrupts. Whenever the voltage changes on the chosen input pin (pin 6 / PB1), it executes the interrupt service routine (ISR), checks the current voltage, and sets the output pin (pin 3 / PB4) to match.
How does an attiny85 interrupt service routine work?
Whenever the voltage changes on the chosen input pin (pin 6 / PB1), it executes the interrupt service routine (ISR), checks the current voltage, and sets the output pin (pin 3 / PB4) to match. This is visible because of an LED (with current limiting resistor) attached to the output pin.
How does an external pin change interrupt work?
This pin change can be triggered by I/O pin configured as input and the change of pin state is introduced by external source. In other cases I/O pin can be configured as output and the interrupt will be triggered by the change of state due to user’s code/instructions.
How are interrupts used in a microcontroller?
ATtiny85, ATtiny85 tutorials Interrupts are one of the most used feature in a microcontroller. Interrupts are events that needs immediate attention by the processor/ controller. When an interrupt occurs controller will pause executing the code in its program memory and execute the code that is associated to interrupt.