AN4654 datasheet(28/32 Pages) STMICROELECTRONICS

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Peripheral migration

AN4654

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The STM32L0 USART provides best-in-class added features:

•

A choice of independent clock sources allowing

–

UART functionality and wake-up from low power modes,

–

convenient baud-rate programming independently of the APB clock

reprogramming.

•

Smartcard emulation capability: T=0 with auto retry and T=1

•

Swappable Tx/Rx pin configuration

•

Binary data inversion

•

Tx/Rx pin active level inversion

•

Transmit/receive enable acknowledge flags

•

New Interrupt sources with flags:

–

Address/character match

–

Block length detection and timeout detection

•

Timeout feature

•

Modbus communication

•

Overrun flag disable

•

DMA disable on reception error

•

Wake-up from STOP mode

•

Auto baud rate detection capability

•

Driver Enable signal (DE) for RS485 mode

For more information about STM32L0 USART features, please refer to USART section of

STM32L0xx Reference Manual (RM0367).

3.18

USB interface

The STM32L0 series embeds an enhanced USB peripheral versus the STM32L1 series.

New features are introduced to provide more capabilities to users.

The STM32L0 USB provides best-in-class added features:

•

Up to 1024 Bytes of dedicated packet buffer memory SRAM

•

Battery Charging Specification Revision 1.2 support

•

USB 2.0 Link Power Management (LPM) support

•

Crystal-less capability with the HSI48 RC oscillator and the CRS, that can use the USB

SOF signal to adjust the frequency on-fly

3.19

LCD interface

The STM32L0 series embeds the same LCD peripheral like in the STM32L1 series but there

was extended number of segments. The LCD embedded in STM32L0 supports up to 8

common terminals and up to 52 segment terminals to drive 208 (4x52) or 384 (8x48) LCD

picture elements (pixels).

The LCD embedded in STM32L1 supports up to 8 common terminals and up to 44 segment

terminals to drive 176 (44x4) or 320 (40x8) LCD picture elements (pixels).

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