STM32U385CG datasheet(40/224 Pages) STMICROELECTRONICS

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When manipulating secrets, the PKA incorporates a protection against side-channel attacks (SCA), including

differential power analysis (DPA), certified SESIP, and PSA security assurance level 3.

The PKA main features are:

•

Acceleration of RSA, DH, and ECC over GF(p) operations, based on the Montgomery method for fast

modular multiplications. More specifically:

–

RSA modular exponentiation, RSA Chinese remainder theorem (CRT) exponentiation

–

ECC scalar multiplication, point on curve check, complete addition, double base ladder, projective to

affine

–

ECDSA signature generation and verification

•

Capability to handle operands up to 4160 bits for RSA/DH and 640 bits for ECC.

•

When manipulating secrets: protection against side-channel attacks (SCA), including differential power

analysis (DPA), certified SESIP, and PSA security assurance level 3. Applicable to modular exponentiation,

ECC scalar multiplication, and ECDSA signature generation

•

Arithmetic and modular operations such as addition, subtraction, multiplication, modular reduction, modular

inversion, comparison, and Montgomery multiplication.

•

Built-in Montgomery domain inward and outward transformations.

•

AMBA® AHB slave peripheral, accessible through 32-bit word single accesses only (otherwise an AHB bus

error is generated, and write accesses are ignored).

•

Support for CCB chaining operations required to protect private key used in PKA protected operations

•

Hardware protections to monitor usage of private keys during protected operation initialization

3.32

Timers and watchdogs

The devices include an advanced control timer, up to six general-purpose timers, two basic timers, up to four low-

power timers, two watchdog timers and two SysTick timers.

The table below compares the features of the advanced control, general-purpose and basic timers.

Table 12. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler factor

DMA request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1

16 bits

Up, down,

Up/down

Any integer between 1

and 65536

Yes

General-

purpose

TIM2, TIM3,

TIM4

32 bits

Up, down,

Up/down

Any integer between 1

and 65536

Yes

General-

purpose

TIM15

16 bits

Any integer between 1

and 65536

Yes

General-

purpose

TIM16,

TIM17

16 bits

Any integer between 1

and 65536

Yes

Basic

TIM6, TIM7

16 bits

Any integer between 1

and 65536

Yes

Low-power

LPTIM1,

LPTIM2,

LPTIM3,

LPTIM4

16 bits

1, 2, 4, 8, 16, 32, 64, or

128

Yes

2(1)

1. LPTIM4 has no capture/compare channel.

3.32.1

Advanced-control timers (TIM1)

The advanced-control timers can each be seen as a three-phase PWM multiplexed on six channels. They have

complementary PWM outputs with programmable inserted deadtimes. They can also be seen as complete

general-purpose timers.

The four independent channels can be used for:

•

Input capture

STM32U385xx

Functional overview

DS14830 - Rev 2

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