STM32L162RC datasheet(27/123 Pages) STMICROELECTRONICS

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STM32L162VC, STM32L162RC

implementation based on a surface charge transfer acquisition principle. It consists of

charging the sensor capacitance and then transferring a part of the accumulated charges

into a sampling capacitor until the voltage across this capacitor has reached a specific

threshold. The capacitive sensing acquisition only requires few external components to

operate. This acquisition is managed directly by the GPIOs, timers and analog I/O groups

(see Section 3.14: System configuration controller and routing interface).

Reliable touch sensing functionality can be quickly and easily implemented using the free

STM32L1xx STMTouch touch sensing firmware library.

3.16

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.

AES data flow can be served by 2ch (DIN/DOUT) of the DMA2 controller

3.17

Timers and watchdogs

The ultra-low-power STM32L162xC devices include seven general-purpose timers, two

basic timers, and two watchdog timers.

Table 7 compares the features of the general-purpose and basic timers.

Table 7. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2,

TIM3,

TIM4

16-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM5

32-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM9

16-bit

Up, down,

up/down

Any integer between

1 and 65536

TIM10,

TIM11

16-bit

Any integer between

1 and 65536

TIM6,

TIM7

16-bit

Any integer between

1 and 65536

Yes

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