STM32U545CE datasheet(73/283 Pages) STMICROELECTRONICS

73 / 283 page

DS14216 Rev 1

73/283

STM32U545xx

Functional overview

•

AMBA® AHB slave peripheral, accessible through 32-bit word single accesses only

(otherwise an AHB bus error is generated, and write accesses are ignored)

•

Secure only programming if TrustZone security is enabled

•

Encryption mode

3.38

Public key accelerator (PKA)

The PKA is intended for the computation of cryptographic public key primitives, specifically

those related to RSA, Diffie-Hellmann or ECC (elliptic curve cryptography) over GF(p)

(Galois fields). To achieve high performance at a reasonable cost, these operations are

executed in the Montgomery domain.

All needed computations are performed within the accelerator, so no further

hardware/software elaboration is needed to process the inputs or the outputs.

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

•

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

•

Protection against differential power analysis (DPA) and related side-channel attacks.

3.39

Timers and watchdogs

The devices include two advanced control timers, up to seven general-purpose timers, two

basic timers, 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 20. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1, TIM8

16 bits

Up, down,

Up/down

Any integer

between 1 and

65536

Yes

General-

purpose

TIM2, TIM3,

TIM4, TIM5

32 bits

Up, down,

Up/down

Any integer

between 1 and

65536

Yes

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