STM8L151C2 datasheet(22/123 Pages) STMICROELECTRONICS

22 / 123 page

Functional overview

STM8L151x2, STM8L151x3

22/123

DS7204 Rev 11

3.12.1

16-bit general purpose timers

•

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)

3.12.2

8-bit basic timer

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.

3.13

Watchdog timers

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

the applications.

3.13.1

Window watchdog timer

The window watchdog (WWDG) is used to detect the occurrence of a software fault, usually

generated by external interferences or by unexpected logical conditions, which cause the

application program to abandon its normal sequence.

3.13.2

Independent watchdog timer

The independent watchdog peripheral (IWDG) can be used to resolve processor

malfunctions due to hardware or software failures.

It is clocked by the internal LSI RC clock source, and thus stays active even in case of a

CPU clock failure.

3.14

Beeper

The beeper function outputs a signal on the BEEP pin for sound generation. The signal is in

the range of 1, 2 or 4 kHz.

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