STM8L151C2 datasheet(21/123 Pages) STMICROELECTRONICS

21 / 123 page

DS7204 Rev 11

21/123

STM8L151x2, STM8L151x3

Functional overview

3.10

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 controls the routing of internal analog signals to ADC1,

COMP1, COMP2, and the internal reference voltage VREFINT. It also provides a set of

registers for efficiently managing the charge transfer acquisition sequence (Section 3.11:

Touch sensing).

3.11

Touch sensing

Low-density STM8L151x2/3 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 (example,

glass, plastic). The capacitive variation introduced by a 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 low-density STM8L15xxx devices, the acquisition sequence

is managed either by software or by hardware and it involves analog I/O groups, the routing

interface, and timers.Reliable touch sensing solutions can be quickly and easily

implemented using the free STM8 Touch Sensing Library.

3.12

Timers

Low-density STM8L151x2/3devices contain two 16-bit general purpose timers (TIM2 and

TIM3) and one 8-bit basic timer (TIM4).

All the timers can be served by DMA1.

Table 2 compares the features of the advanced control, general-purpose and basic timers.

Table 2. Timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler factor

DMA1

request

generation

Capture/compare

channels

Complementary

outputs

TIM2

16-bit

up/down

Any power of 2

from 1 to 128

Yes

None

TIM3

TIM4

8-bit

Any power of 2

from 1 to 32768

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