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型號(hào)：	S80C32XXX-40R
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 40 MHz, MICROCONTROLLER, PQCC44
文件頁數(shù)：	32/1021頁
文件大?。?/td>	15196K
代理商：	S80C32XXX-40R

32072H–AVR32–10/2012

AT32UC3A3

11. External Interrupt Controller (EIC)

Rev: 2.4.0.0

Features

Dedicated interrupt request for each interrupt

Individually maskable interrupts

Interrupt on rising or falling edge

Interrupt on high or low level

Asynchronous interrupts for sleep modes without clock

Filtering of interrupt lines

Maskable NMI interrupt

Keypad scan support

Overview

The External Interrupt Controller (EIC) allows pins to be configured as external interrupts. Each

external interrupt has its own interrupt request and can be individually masked. Each external

interrupt can generate an interrupt on rising or falling edge, or high or low level. Every interrupt

input has a configurable filter to remove spikes from the interrupt source. Every interrupt pin can

also be configured to be asynchronous in order to wake up the part from sleep modes where the

CLK_SYNC clock has been disabled.

A Non-Maskable Interrupt (NMI) is also supported. This has the same properties as the other

external interrupts, but is connected to the NMI request of the CPU, enabling it to interrupt any

other interrupt mode.

The EIC can wake up the part from sleep modes without triggering an interrupt. In this mode,

code execution starts from the instruction following the sleep instruction.

The External Interrupt Controller has support for keypad scanning for keypads laid out in rows

and columns. Columns are driven by a separate set of scanning outputs, while rows are sensed

by the external interrupt lines. The pressed key will trigger an interrupt, which can be identified

through the user registers of the module.

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