does the arduino wire library use interrupts

The first type (Type 1) is triggered by an event that sets the Interrupt Flag.There are basically two types of interrupts….The SREG I-bit is automatically set to logic one when a Return from Interrupt instruction – RETI – is executed.All enabled interrupts can then interrupt the current interrupt routine.

The user software can write logic one to the I-bit to enable nested interrupts.

This is done by (4) clearing the SREG Global Interrupt Enable I-bit.įigure 4: Interrupt Process Diagram Type 1

It also turns off the interrupt system to prevent further interrupts while one is in progress.

(1) When an interrupt occurs, (2) the microcontroller completes the current instruction and (3) stores the address of the next instruction on the stack.

Pin Change Interrupt Request 2 (pins D0 to D7) Pin Change Interrupt Request 1 (pins A0 to A5) Pin Change Interrupt Request 0 (pins D8 to D13) RESET has the highest priority, and next is INT0 – the External Interrupt Request 0. The lower the address the higher is the priority level.

The list also determines the priority levels of the different interrupts.

Each Interrupt Vector occupies two instruction words.

The complete list of vectors is shown in Table 11-6 “Reset and Interrupt Vectors in ATMega328P.

These interrupts and the separate Reset Vector each have a separate program vector located at the lowest addresses in the Flash program memory space.

The ATmega328P provides support for 25 different interrupt sources.

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Does the arduino wire library use interrupts