STM32WLE4JC datasheet(39/146 Pages) STMICROELECTRONICS

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DS13105 Rev 9

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STM32WLE5/E4xx

Functional overview

3.16

Interrupts and events

3.16.1

Nested vectored interrupt controller (NVIC)

The devices embed an NIVC able to manage 16 priority levels, and to handle up to

62 maskable interrupt channels plus the 16 interrupt lines of the Cortex-M4.

The NVIC benefits are the following:

•

low-latency interrupt processing

•

interrupt entry vector table address passed directly to the core

•

early processing of interrupts

•

processing of late-arriving higher-priority interrupts

•

support for tail chaining

•

processor state automatically saved

•

interrupt entry restored on interrupt exit, with no instruction overhead

The NVIC hardware block provides flexible interrupt management features with minimal

interrupt latency.

3.16.2

Extended interrupt/event controller (EXTI)

The EXTI manages wakeup through configurable and direct event inputs. It provides wake-

up requests to the power control, and generates interrupt requests to the CPU NVIC and

events to the CPU event input.

Configurable events/interrupts come from peripherals that are able to generate a pulse and

allow the selection between the event/interrupt trigger edge and a software trigger.

Direct events/interrupts come from peripherals having their own clearing mechanism.

3.17

Cyclic redundancy check (CRC)

The CRC calculation unit is used to get a CRC code from 8-, 16- or 32-bit data word and a

generator polynomial.

Among other applications, CRC-based techniques are used to verify data transmission or

storage integrity. In the scope of the functional safety standards, they offer a means of

verifying the Flash memory integrity. The CRC calculation unit helps to compute a signature

of he software during runtime, to be compared with a reference signature generated at link

time and stored at a given memory location.

3.18

Analog-to-digital converter (ADC)

A native 12-bit ADC is embedded into the devices. It can be extended to 16-bit resolution

through hardware oversampling. The ADC has up to 12 external channels and four internal

channels (temperature sensor, voltage reference, VBAT(a) monitoring, DAC output). The

ADC performs conversions in single-shot or scan mode. In scan mode, automatic

conversion is performed on a selected group of analog inputs.

a. VDD on STM32WLE5/E4UxYx devices.

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