STM8L151C8 datasheet(21/134 Pages) STMICROELECTRONICS

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STM8L15xx8, STM8L15xR6

Functional overview

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

(see Section 3.13: Touch sensing).

3.13

Touch sensing

The high density and medium+ density STM8L15xx devices provide a simple solution for

adding capacitive sensing functionality to any application. Capacitive sensing technology is

able to detect finger presence near an electrode which is protected from direct touch by a

dielectric (glass, plastic, ...). The capacitive variation introduced by the finger (or any

conductive object) is measured using a proven implementation based on a surface charge

transfer acquisition principle. It consists of charging the electrode 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. In the high density and medium+

density STM8L15xx devices, the acquisition sequence is managed by software and it

involves analog I/O groups and the routing interface.

Reliable touch sensing solution can be quickly and easily implemented using the free STM8

touch sensing firmware library.

3.14

Timers

The high density and medium+ density STM8L15xx 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 can be 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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