AN4654 datasheet(18/32 Pages) STMICROELECTRONICS

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Peripheral migration

AN4654

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DocID027444 Rev 1

Alternate function mode

Alternate function configuration is similar for both products, the STM32L0 series has

reduced number of alternate functions in comparison to STM32L1 series. Consequently,

different alternate function number on given pin should be used for the same alternate

function.

Please refer to the “Alternate function mapping” table in the STM32L0 and STM32L1

datasheets for the detailed mapping of the system and the peripheral alternate function I/O

pins.

3.8

EXTI source selection

In STM32L0 some of the EXTI lines are direct: they are used by some peripherals to

generate a wakeup from Stop event or interrupt. In this case the status flag is provided by

the peripheral.

Other changes are only in number of EXTI lines: on STM32L0 there are 30 lines (22

configurable, and 7 direct), on STM32L1 there are 24 lines.

3.9

Timers (TIM)

In STM32L0 there is a modified set of timers (TIM2, TIM3,TIM6, TIM7, TIM21 and TIM22)

and a new one (LPTIM1) optimized for low power consumption and run in low power modes.

In STM32L1 the list of timers is made up of TIM2, TIM3, TIM4, TIM5, TIM6, TIM7, TIM9,

TIM10 and TIM11.

Synchronization capabilities can differ between timers, the user has to check details in the

already cited reference manuals. Table 8 details the different configurations, the fully

compatible timers are TIM2, TIM3, TIM6 and TIM7.

Table 8. Timers configuration for STM32L0 and STM32L1 series

Series

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA request

generation

Capture/compare

channels

Complementary

outputs

TIM21

TIM22

16-bit

Up, down,

up/down

Any integer

between

1 and 65536

TIM4

16-bit

Up, down,

up/down

Any integer

between

1 and 65536

Yes

TIM5

32-bit

Up, down,

up/down

Any integer

between

1 and 65536

Yes

TIM9

16-bit

Up, down,

up/down

Any integer

between

1 and 65536

TIM10

TIM11

16-bit

Any integer

between

1 and 65536

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