AF remap and debug I/O configuration register (AFIO_MAPR)
| SPI1_REMAP | SPI1 remapping |
| I2C1_REMAP | I2C1 remapping |
| USART1_REMAP | USART1 remapping |
| USART2_REMAP | USART2 remapping |
| USART3_REMAP | USART3 remapping |
| TIM1_REMAP | TIM1 remapping |
| TIM2_REMAP | TIM2 remapping |
| TIM3_REMAP | TIM3 remapping |
| TIM4_REMAP | TIM4 remapping |
| CAN1_REMAP | CAN1 remapping |
| PD01_REMAP | Port D0/Port D1 mapping on OSCIN/OSCOUT |
| TIM5CH4_IREMAP | Set and cleared by software |
| ETH_REMAP | Ethernet MAC I/O remapping |
| CAN2_REMAP | CAN2 I/O remapping |
| MII_RMII_SEL | MII or RMII selection |
| SWJ_CFG | Serial wire JTAG configuration |
| SPI3_REMAP | SPI3/I2S3 remapping |
| TIM2ITR1_IREMAP | TIM2 internal trigger 1 remapping |
| PTP_PPS_REMAP | Ethernet PTP PPS remapping |