STM32WBA50KG datasheet(40/110 Pages) STMICROELECTRONICS

40 / 110 page

Functional overview

STM32WBA50KG

40/110

DS14688 Rev 1

•

Automatic data flow control with support of direct memory access (DMA) using one

channel. Single or fixed burst of 4 supported.

•

Interruptible message digest computation, on a per-32-bit word basis

–

Re-loadable digest registers

–

Hashing computation suspend/resume mechanism, including using DMA

3.22

Public key accelerator (PKA)

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

those related to RSA, DU (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 CRT (Chinese remainder theorem)

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

3.23

Timers and watchdogs

The devices include one advanced control timer, two general-purpose timers, one

low-power timer, two watchdog timers, and two SysTick timers.

Table 14 compares the features of the advanced control and general-purpose timers.

Table 14. Timers comparison

Type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMArequest

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

32 bits

Up, down,

up/down

4No

TIM16

16 bits

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