STM32L063C8 datasheet(31/121 Pages) STMICROELECTRONICS

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STM32L063x8

Functional overview

3.18

AES

The AES Hardware Accelerator can be used to encrypt and decrypt data using the AES

algorithm (compatible with FIPS PUB 197, 2001 Nov 26).



Key scheduler



Key derivation for decryption



128-bit data block processed



128-bit key length



213 clock cycles to encrypt/decrypt one 128-bit block



Electronic codebook (ECB), cypher block chaining (CBC), and counter mode (CTR)

supported by hardware.

The AES can be served by the DMA controller.

3.19

Timers and watchdogs

The ultra-low-power STM32L063x8 devices include three general-purpose timers, one low-

power timer (LPTIM), one basic timer, two watchdog timers and the SysTick timer.

Table 9 compares the features of the general-purpose and basic timers.

3.19.1

General-purpose timers (TIM2, TIM21 and TIM22)

There are three synchronizable general-purpose timers embedded in the STM32L063x8

devices (see Table 9 for differences).

TIM2

TIM2 is based on 16-bit auto-reload up/down counter. It includes a 16-bit prescaler. It

features four independent channels each for input capture/output compare, PWM or one-

pulse mode output.

The TIM2 general-purpose timers can work together or with the TIM21 and TIM22 general-

purpose timers via the Timer Link feature for synchronization or event chaining. Their

counter can be frozen in debug mode. Any of the general-purpose timers can be used to

generate PWM outputs.

TIM2 has independent DMA request generation.

Table 9. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2

16-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM21,

TIM22

16-bit

Up, down,

up/down

Any integer between

1 and 65536

TIM6

16-bit

Any integer between

1 and 65536

Yes

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