STM32G474PBY3XXX datasheet(30/236 Pages) STMICROELECTRONICS

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Functional overview

STM32G474xB STM32G474xC STM32G474xE

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DS12288 Rev 5

3.14

General-purpose inputs/outputs (GPIOs)

Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as

input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the

GPIO pins are shared with digital or analog alternate functions. Fast I/O toggling can be

achieved thanks to their mapping on the AHB2 bus.

The I/Os alternate function configuration can be locked if needed following a specific

sequence in order to avoid spurious writing to the I/Os registers.

3.15

Direct memory access controller (DMA)

The device embeds 2 DMAs. Refer to Table 4: DMA implementation for the features

implementation.

Direct memory access (DMA) is used in order to provide a high-speed data transfer

between peripherals and memory as well as from memory to memory. Data can be quickly

moved by DMA without any CPU actions. This keeps the CPU resources free for other

operations.

The two DMA controllers have 16 channels in total, each one dedicated to manage memory

access requests from one or more peripherals. Each controller has an arbiter for handling

the priority between DMA requests.

The DMA supports:

•

16 independently configurable channels (requests)

–

Each channel is connected to a dedicated hardware DMA request, a software

trigger is also supported on each channel. This configuration is done by software.

•

Priorities between requests from channels of one DMA are both software

programmable (4 levels: very high, high, medium, low) or hardware programmable in

case of equality (request 1 has priority over request 2, etc.)

•

Independent source and destination transfer size (byte, half word, word), emulating

packing and unpacking. Source/destination addresses must be aligned on the data

size.

•

Support for circular buffer management

•

3 event flags (DMA half transfer, DMA transfer complete and DMA transfer error)

logically ORed together in a single interrupt request for each channel

•

Memory-to-memory transfer

•

Peripheral-to-memory, memory-to-peripheral, and peripheral-to-peripheral transfers

•

Access to Flash, SRAM, APB and AHB peripherals as source and destination

•

Programmable number of data to be transferred: up to 65536.

Table 4. DMA implementation

DMA features

DMA1

DMA2

Number of regular channels

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