ST STM32F101 series Reference Manual page 190

Advanced arm-based 32-bit mcus

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Bit 2 USART1_REMAP: USART1 remapping

Bit 1 I2C1_REMAP: I2C1 remapping

Bit 0 SPI1_REMAP: SPI1 remapping

General-purpose and alternate-function I/Os (GPIOs and AFIOs)

This bit is set and cleared by software. It controls the mapping of USART1 TX and RX

alternate functions on the GPIO ports.

0: No remap (TX/PA9, RX/PA10)

1: Remap (TX/PB6, RX/PB7)

This bit is set and cleared by software. It controls the mapping of I2C1 SCL and SDA

alternate functions on the GPIO ports.

0: No remap (SCL/PB6, SDA/PB7)

1: Remap (SCL/PB8, SDA/PB9)

This bit is set and cleared by software. It controls the mapping of SPI1 NSS, SCK, MISO,

MOSI alternate functions on the GPIO ports.

0: No remap (NSS/PA4, SCK/PA5, MISO/PA6, MOSI/PA7)

1: Remap (NSS/PA15, SCK/PB3, MISO/PB4, MOSI/PB5)

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