STM32U5A5QJ datasheet(60/382 Pages) STMICROELECTRONICS

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Functional overview

STM32U5Axxx

60/382

DS13543 Rev 1

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interrupt entry restored on interrupt exit with no instruction overhead

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TrustZone support: NVIC registers banked across secure and nonsecure states

The NVIC hardware block provides flexible interrupt management features with minimal

interrupt latency.

3.22.2

Extended interrupt/event controller (EXTI)

The EXTI manages the individual CPU and system wake-up through configurable event

inputs. It provides wake-up requests to the power control, and generates an interrupt

request to the CPU NVIC and events to the CPU event input. For the CPU an additional

event generation block (EVG) is needed to generate the CPU event signal.

The EXTI wake-up requests allow the system to be woken up from Stop modes.

The interrupt request and event request generation can also be used in Run modes.

The EXTI also includes the EXTI multiplexer I/O port selection.

The EXTI main features are the following:

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All event inputs allowed to wake up the system

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Configurable events (signals from I/Os or peripherals able to generate a pulse)

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Selectable active trigger edge

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Interrupt pending status register bit independent for the rising and falling edge

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Individual interrupt and event generation mask, used for conditioning the CPU

wake-up, interrupt and event generation

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Software trigger possibility

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TrustZone secure events

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The access to control and configuration bits of secure input events can be made

secure

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EXTI I/O port selection

3.23

Cyclic redundancy check calculation unit (CRC)

The CRC is used to get a CRC code using a configurable generator with polynomial value

and size.

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

or storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a mean to verify

the flash memory integrity.

The CRC calculation unit helps to compute a signature of the software during runtime, that

can be ulteriorly compared with a reference signature generated at link-time and that can be

stored at a given memory location.

3.24

CORDIC co-processor (CORDIC)

The CORDIC co-processor provides hardware acceleration of certain mathematical

functions, notably trigonometric, commonly used in motor control, metering, signal

processing and many other applications. It speeds up the calculation of these functions

compared to a software implementation, allowing a lower operating frequency, or freeing up

processor cycles in order to perform other tasks.

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