External Interrupt/Event Controller (Exti); Main Features; Block Diagram; Figure 18. External Interrupt/Event Controller Block Diagram - ST STM32F100 Series Reference Manual

Advanced arm-based 32-bit mcus

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Table of Contents

Interrupts and events

External interrupt/event controller (EXTI)

The external interrupt/event controller consists of up to 18 edge detectors for generating

event/interrupt requests. Each input line can be independently configured to select the type

(event or interrupt) and the corresponding trigger event (rising or falling or both). Each line

can also masked independently. A pending register maintains the status line of the interrupt

The EXTI controller main features are the following:

Independent trigger and mask on each interrupt/event line

Dedicated status bit for each interrupt line

Generation of up to 18 software event/interrupt requests

Detection of external signal with pulse width lower than APB2 clock period. Refer to the

electrical characteristics section of the datasheet for details on this parameter.

The block diagram is shown in

To NVIC interrupt

RM0041 Rev 6

AMBA APB bus

Peripheral interface

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