STM8L051F3 datasheet(17/46 Pages) STMICROELECTRONICS

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STM8L051F3

Functional overview

Doc ID 022985 Rev 1

17/46

3.9

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

and the internal reference voltage VREFINT.

3.10

Timers

Low density value line STM8L05xxx devices 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 3 compares the features of the advanced control, general-purpose and basic timers.

3.10.1

16-bit general purpose timers (TIM2, TIM3)

●

16-bit autoreload (AR) up/down-counter

●

7-bit prescaler adjustable to fixed power of 2 ratios (1…128)

●

2 individually configurable capture/compare channels

●

PWM mode

●

Interrupt capability on various events (capture, compare, overflow, break, trigger)

●

Synchronization with other timers or external signals (external clock, reset, trigger and

enable)

3.10.2

8-bit basic timer (TIM4)

The 8-bit timer consists of an 8-bit up auto-reload counter driven by a programmable

prescaler. It can be used for timebase generation with interrupt generation on timer overflow.

3.11

Watchdog timers

The watchdog system is based on two independent timers providing maximum security to

the applications.

Table 3.

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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