AN2645 datasheet(25/36 Pages) STMICROELECTRONICS

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AN2645

Block-by-block compatibility analysis

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3.3

Timers

All STM8S Performance Line and Access Line sub-families are equipped with the following

timers:

●

TIM1 advanced control timer: 16-bit up/down auto reload counter with 16-bit prescaler,

wide range of modes, 4x16-bit CAPCOM channels, 3 of them have a complementary

output)

●

TIM2 general purpose timer (3x16-bit CAPCOM channels)

●

TIM3 general purpose timers (2x16-bit CAPCOM channels)

●

TIM4 basic timer: (1x8bit, no CAPCOM channel, no output)

This means a total of up to 9x16-bit CAPCOM channels, 9 inputs/outputs and 3

complementary outputs.

TIM1 is an up/down counter, the others are up counters only. Timer pins, mainly from TIM1,

can be remapped to other pins. You have to check the options in the datasheet pinout

description and program the option byte settings accordingly.

TIM1 can be triggered externally by the ETR pin or by its TI1 and TI2 inputs or receive an

external break signal from the BKIN pin. The ETR, BKIN and all of TIM1 pins are present on

all packages except in STM8S103x 20-pin devices which lack the ETR and CH3N signals.

In the STM8S903x sub-family, TIM1 can also be synchronized internally with TIM5 and

TIM6. The TIM5 and TIM6 are enhanced timers which are present only in the STM8S903x

sub-family only. They have an added synchronization circuit which lets you control them with

external signals and interconnect several timers.

Table 21.

Total number of timer channels (direct I/Os + complementary outputs) in

each package

Sub-family

LQFP80

(xxxM)

LQFP64

(xxxR)

LQFP48

(xxxC)

LQFP44

(xxxS)

LQFP32

(xxxK)

LQFP20

(xxxF)

STM8S208x

9 (9+3)

STM8S207x

9 (9+3)

7 (7+3)

8 (8+3)

STM8S105x

9 (9+3)

7 (7+3)

8 (8+3)

STM8S103x

7 (7+3)

7 (7+2)

STM8S903x

7 (7+3)

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