STM32WBA62CG datasheet(43/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

A peripheral is in secure state:

•

For securable peripherals, when the corresponding SEC security bit is set in the TZSC

(TrustZone security controller).

•

For TrustZone-aware peripherals, when a security feature of the peripheral is enabled

through dedicated peripheral bits.

3.14

General-purpose input/output (GPIO)

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.

After reset, all GPIOs are in analog mode to reduce power consumption.

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

sequence, to avoid spurious writing to the I/Os registers.

The GPIO allows dynamic I/O control in Stop 0 mode thanks to GPDMA1. All I/Os can be

configured and controlled as input or output (open-drain or push-pull depending on GPIO

configuration).

When enabled in the PWR, latest I/Os output level can be retained by pulling the I/Os high

or low before entering Standby mode. I/O levels are retained after exit from Standby mode,

until they are reconfigured by software.

3.14.1

GPIO TrustZone security

Each I/O pin of GPIO port can be individually configured as secure. When the selected I/O

pin is configured as secure, its corresponding configuration bits for alternate function, mode

selection, I/O data are secure against a nonsecure access. The associated registers bit

access is restricted to a secure software only. After reset, all GPIO ports are secure.

3.15

System configuration controller (SYSCFG)

The main purpose of the SYSCFG (system configuration controller) are the following:

•

Managing robustness features

•

Configuring FPU interrupts

•

Enabling/disabling the I2C fast-mode plus (FMP) high-drive mode of some I/Os and

booster for I/Os analog switches

•

Managing the I/O compensation

•

Provides memory erase status

•

Communication channel with the RSS

3.15.1

SYSCFG TrustZone security

When TrustZone security is activated by the TZEN option bit, the SYSCFG is switched in

TrustZone security mode.

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