ATXMEGA64A1 datasheet(25/99 Pages) ATMEL

25 / 99 page

8067I–AVR–04/09

XMEGA A1

13. PMIC - Programmable Multi-level Interrupt Controller

13.1

Features

• Separate interrupt vector for each interrupt

• Short, predictable interrupt response time

• Programmable Multi-level Interrupt Controller

– 3 programmable interrupt levels

– Selectable priority scheme within low level interrupts (round-robin or fixed)

– Non-Maskable Interrupts (NMI)

• Interrupt vectors can be moved to the start of the Boot Section

13.2

Overview

XMEGA A1 has a Programmable Multi-level Interrupt Controller (PMIC). All peripherals can

define three different priority levels for interrupts; high, medium or low. Medium level interrupts

may interrupt low level interrupt service routines. High level interrupts may interrupt both low-

and medium level interrupt service routines. Low level interrupts have an optional round robin

scheme to make sure all interrupts are serviced within a certain amount of time.

The built in oscillator failure detection mechanism can issue a Non-Maskable Interrupt (NMI).

13.3

Interrupt vectors

When an interrupt is serviced, the program counter will jump to the interrupt vector address. The

interrupt vector is the sum of the peripheral’s base interrupt address and the offset address for

specific interrupts in each peripheral. The base addresses for the XMEGA A1 devices are shown

in Table 13-1. Offset addresses for each interrupt available in the peripheral are described for

each peripheral in the XMEGA A manual. For peripherals or modules that have only one inter-

rupt, the interrupt vector is shown in Table 13-1. The program address is the word address.

Table 13-1.

Reset and Interrupt Vectors

Program Address

(Base Address)

Source

Interrupt Description

0x000

RESET

0x002

OSCF_INT_vect

Crystal Oscillator Failure Interrupt vector (NMI)

0x004

PORTC_INT_base

Port C Interrupt base

0x008

PORTR_INT_base

Port R Interrupt base

0x00C

DMA_INT_base

DMA Controller Interrupt base

0x014

RTC_INT_base

Real Time Counter Interrupt base

0x018

TWIC_INT_base

Two-Wire Interface on Port C Interrupt base

0x01C

TCC0_INT_base

Timer/Counter 0 on port C Interrupt base

0x028

TCC1_INT_base

Timer/Counter 1 on port C Interrupt base

0x030

SPIC_INT_vect

SPI on port C Interrupt vector

0x032

USARTC0_INT_base

USART 0 on port C Interrupt base

0x038

USARTC1_INT_base

USART 1 on port C Interrupt base

0x03E

AES_INT_vect

AES Interrupt vector

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