STM32W108HB datasheet(157/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

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10.1

Functional description

The timers can optionally use GPIOs in the PA and PB ports for external inputs or outputs.

As with all STM32W108 digital inputs, a GPIO used as a timer input can be shared with

other uses of the same pin. Available timer inputs include an external timer clock, a clock

mask, and four input channels. Any GPIO used as a timer output must be configured as an

alternate output and is controlled only by the timer.

Many of the GPIOs that can be assigned as timer outputs can also be used by another on-

chip peripheral such as a serial controller. Use as a timer output takes precedence over

another peripheral function, as long as the channel is configured as an output in the

TIMx_CCMR1 register and is enabled in the TIMx_CCER register.

The GPIOs that can be used by Timer 1 are fixed, but the GPIOs that can be used as Timer

2 channels can be mapped to either of two pins, as shown in Table 32. The Timer 2 Option

channel is mapped to its default GPIO in port PA, or remapped to a GPIO in PB.

Table 32 specifies the pins that may be assigned to Timer 1 and Timer 2 functions.

Timer 1

Timer 2

(REMAPCy = 0)

Timer 2

(REMAPCy = 1)

The TIMxCLK and TIMxMSK inputs can be used only in the external clock modes: refer to

the External Clock Source Mode 1 and External Clock Source Mode 2 sections for details

concerning their use.

10.1.1

Time-base unit

The main block of the general purpose timer is a 16-bit counter with its related auto-reload

be divided by a prescaler.

The counter, the auto-reload register, and the prescaler register can be written to or read by

software. This is true even when the counter is running.

The time-base unit includes:

●

Counter register (TIMx_CNT)

●

Prescaler register (TIMx_PSC)

●

Auto-reload register (TIMx_ARR)

Some timer registers cannot be directly accessed by software, which instead reads and

writes a "buffer register". The internal registers actually used for timer operations are called

"shadow registers".

Table 32.

Timer GPIO use

Signal (direction)

TIMxC1

(in or out)

TIMxC2

(in or out)

TIMxC3

(in or out)

TIMxC4

(in or out)

TIMxCLK

(in)

TIMxMSK

(in)

PB6

PB7

PA6

PA7

PB0

PB5

PA0

PA3

PA1

PA2

PB5

PB0

PB1

PB2

PB3

PB4

PB5

PB0

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