With MCU Only = 0, the backup boot mode is selected via pins within the main BOOTMODE map. Table 4-9 lists all possible backup boot modes when MCU Only = 0. For backup boot modes when MCU Only = 1, please refer to Table 4-6.
Table 4-9 Backup Mode Selection When MCU Only (MCU 6) = 0| Backup Boot Mode Pins | Backup Boot Mode Selected |
|---|
| 3 | 2 | 1 |
|---|
| 0 | 0 | 0 | None (no backup boot will be attempted) |
| 0 | 0 | 1 | USB – Device (DFU) |
| 0 | 1 | 0 | Reserved
|
| 0 | 1 | 1 | UART |
| 1 | 0 | 0 | Ethernet |
| 1 | 0 | 1 | MMC/SD card |
| 1 | 1 | 0 | SPI |
| 1 | 1 | 1 | I2C |