STM32F102xx datasheet(18/41 Pages) STMICROELECTRONICS

18 / 41 page

STM32F10xx8 and STM32F10xxB silicon limitations

STM32F10xx8 STM32F10xxB

18/41

DocID14574 Rev 13

Workaround

I2C2 SMBA can be used as an output if SPI2 is configured in master mode with NSS in

software mode.

I2C2 SMBA can be used in input mode if SPI2 is configured in master or slave mode with

NSS managed by software.

SPI2 cannot be used in any other configuration when I2C2 is being used.

USART3 must not be used in synchronous mode when I2C2 is being used.

2.8.7

I2C1 with SPI1 remapped and used in master mode

Conditions

•

I2C1 and SPI1 are clocked.

•

SPI1 is remapped.

•

I/O port pin PB5 is configured as an alternate function output.

Description

Conflict between the SPI1 MOSI signal and the I2C1 SMBA signal (even if SMBA is not

used).

Workaround

Do not use SPI1 remapped in master mode and I2C1 together.

When using SPI1 remapped, the I2C1 clock must be disabled.

2.8.8

I2C1 and TIM3_CH2 remapped

Conditions

•

I2C1 and TIM3 are clocked.

•

I/O port pin PB5 is configured as an alternate function output.

Description

Conflict between the TIM3_CH2 signal and the I2C1 SMBA signal, (even if SMBA is not

used).

In these cases the I/O port pin PB5 is set to 1 by default if the I/O alternate function output is

selected and I2C1 is clocked. TIM3_CH2 cannot be used in output mode.

Workaround

To avoid this conflict, TIM3_CH2 can only be used in input mode.

2.8.9

USARTx_TX pin usage

Description

In USART receive-mode-only communication (TE = 0 in the USARTx_CR1 register), even

when the USARTx_TX pin is not being used, the corresponding I/O port pin cannot be used

to output another alternate function (in this mode the USARTx_TX output is set to 1 and

thus no other alternate function output can be used).

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