STM8S datasheet(141/467 Pages) STMICROELECTRONICS

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RM0016

16-bit advanced control timer (TIM1)

261

17.3

TIM1 time base unit

The timer has a time base unit that includes:

•

16-bit up/down counter

•

16-bit auto-reload register

•

Repetition counter

•

Prescaler

Figure 32. Time base unit

The 16-bit counter, the prescaler, the auto-reload register and the repetition counter register

can be written or read by software.

The auto-reload register is composed of a preload register plus a shadow register.

Writing to the auto-reload register can be done in two modes:

•

Auto-reload preload enabled (ARPE bit set in the TIM1_CR1 register). In this mode,

when data is written to the auto-reload register, it is kept in the preload register and

transferred into the shadow register at the next update event (UEV).

•

Auto-reload preload disabled (ARPE bit cleared in the TIM1_CR1 register). In this

mode, when data is written to the auto-reload register it is transferred into the shadow

An update event is generated:

•

On a counter overflow or underflow

•

By software, setting the UG bit in the TIM1_EGR register

•

By a trigger event from the clock/trigger controller

With preload enabled (ARPE = 1), when an update event occurs: The auto-reload shadow

reloaded with the preload value (content of the TIM1_PSCR register).

The UEV can be disabled by setting the UDIS bit in the TIM1_CR1

The counter is clocked by the prescaler output CK_CNT, which is enabled only when the

counter enable bit (CEN) in TIM1_CR1 register is set.

Note:

The actual counter enable signal CNT_EN is set 1 clock cycle after CEN.

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