STM32F102xx datasheet(16/41 Pages) STMICROELECTRONICS

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STM32F10xx8 and STM32F10xxB silicon limitations

STM32F10xx8 STM32F10xxB

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DocID14574 Rev 13

2.8

Alternate function

In some specific cases, some potential weakness may exist between alternate functions

mapped onto the same pin.

2.8.1

USART1_RTS and CAN_TX

Conditions

•

USART1 is clocked

•

CAN is not clocked

•

I/O port pin PA12 is configured as an alternate function output.

Description

Even if CAN_TX is not used, this signal is set by default to 1 if I/O port pin PA12 is

configured as an alternate function output.

In this case USART1_RTS cannot be used.

Workaround

When USART1_RTS is used, the CAN must be remapped to either another IO configuration

when the CAN is used, or to the unused configuration (CAN_REMAP[1:0] set to “01”) when

the CAN is not used.

2.8.2

SPI1 in slave mode and USART2 in synchronous mode

Conditions

•

SPI1 and USART2 are clocked

•

I/O port pin PA4 is configured as an alternate function output.

Description

USART2 cannot be used in synchronous mode (USART2_CK signal), if SPI1 is used in

slave mode.

Workaround

None.

2.8.3

SPI1 in master mode and USART2 in synchronous mode

Conditions

•

SPI1 and USART2 are clocked

•

I/O port pin PA4 is configured as an alternate function output.

Description

USART2 cannot be used in synchronous mode (USART2_CK signal) if SPI1 is used in

master mode and SP1_NSS is configured in software mode. In this case USART2_CK is

not output on the pin.

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