STM32L433CB datasheet(38/225 Pages) STMICROELECTRONICS

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Functional overview

STM32L433xx

38/225

DS11449 Rev 5

3.14

Interrupts and events

3.14.1

Nested vectored interrupt controller (NVIC)

The devices embed a nested vectored interrupt controller able to manage 16 priority levels,

and handle up to 67 maskable interrupt channels plus the 16 interrupt lines of the Cortex®-

M4.

The NVIC benefits are the following:

•

Closely coupled NVIC gives low latency interrupt processing

•

Interrupt entry vector table address passed directly to the core

•

Allows early processing of interrupts

•

Processing of late arriving higher priority interrupts

•

Support for tail chaining

•

Processor state automatically saved on interrupt entry, and restored on interrupt exit,

with no instruction overhead

The NVIC hardware block provides flexible interrupt management features with minimal

interrupt latency.

3.14.2

Extended interrupt/event controller (EXTI)

The extended interrupt/event controller consists of 37 edge detector lines used to generate

interrupt/event requests and wake-up the system from Stop mode. Each external line can be

independently configured to select the trigger event (rising edge, falling edge, both) and can

be masked independently. A pending register maintains the status of the interrupt requests.

The internal lines are connected to peripherals with wakeup from Stop mode capability. The

EXTI can detect an external line with a pulse width shorter than the internal clock period. Up

to 83 GPIOs can be connected to the 16 external interrupt lines.

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