STM8AL31E8X datasheet(22/133 Pages) STMICROELECTRONICS

22 / 133 page

Functional overview

STM8AL31E8x STM8AL3LE8x

22/133

DocID027180 Rev 5

3.12

System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports. TIM4 and ADC1 DMA channels can also be remapped.

The highly flexible routing interface allows application software to control the routing of

different I/Os to the TIM1 timer input captures. It also controls the routing of internal analog

signals to ADC1, COMP1, COMP2, DAC1 and the internal reference voltage VREFINT. It also

provides a set of registers for efficiently managing the charge transfer acquisition sequence.

3.13

AES

The AES Hardware Accelerator can be used to encipher and decipher 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

•

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

AES data flow can be served by the DMA1 controller

3.14

Timers

The high-density STM8AL3xE8x devices contain one advanced control timer (TIM1), three

16-bit general purpose timers (TIM2,TIM3 and TIM5) and one 8-bit basic timer (TIM4).

All the timers are served by DMA1.

Table 3 compares the features of the advanced control, general-purpose and basic timers.

Table 3. Timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler factor

DMA1

request

generation

Capture/compare

channels

Complementary

outputs

TIM1

16-bit

up/down

Any integer

from 1 to 65536

Yes

3 + 1

TIM2

Any power of 2

from 1 to 128

None

TIM3

TIM5

TIM4

8-bit

Any power of 2

from 1 to 32768

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