STM32L443CC datasheet(44/215 Pages) STMICROELECTRONICS

44 / 215 page

Functional overview

STM32L443CC STM32L443RC STM32L443VC

44/215

DS11421 Rev 4

decipher data using AES algorithm.

The AES peripheral supports:

•

Encryption/Decryption using AES Rijndael Block Cipher algorithm

•

NIST FIPS 197 compliant implementation of AES encryption/decryption algorithm

•

128-bit and 256-bit register for storing the encryption, decryption or derivation key (4x

32-bit registers)

•

Electronic codebook (ECB), Cipher block chaining (CBC), Counter mode (CTR), Galois

Counter Mode (GCM), Galois Message Authentication Code mode (GMAC) and Cipher

Message Authentication Code mode (CMAC) supported.

•

Key scheduler

•

Key derivation for decryption

•

128-bit data block processing

•

128-bit, 256-bit key length

•

1x32-bit INPUT buffer and 1x32-bit OUTPUT buffer.

•

One 128-bit Register for the initialization vector when AES is configured in CBC mode

or for the 32-bit counter initialization when CTR mode is selected, GCM mode or

CMAC mode.

•

Automatic data flow control with support of direct memory access (DMA) using 2

channels, one for incoming data, and one for outcoming data.

•

Suspend a message if another message with a higher priority needs to be processed

3.24

Timers and watchdogs

The STM32L443xx includes one advanced control timers, up to five general-purpose timers,

two basic timers, two low-power timers, two watchdog timers and a SysTick timer. The table

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

Table 9. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1

16-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM2

32-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM15

16-bit

Any integer

between 1

and 65536

Yes

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