SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
ROM Code always configures the UART port to 115200 kbaud, 8-n-1 mode, and the XMODEM protocol is used to transfer the boot data.
| BOOTMODE Pins | Field | Value | Description | MCU Only=1 Value |
|---|---|---|---|---|
| 6 | Reserved | - | Not used | N/A |
| 5 | Reserved | - | Not used | N/A |
| 4 (7)(1) | Port | 0 | MCU_UART (port 0) | 0 |
| 1 | WKUP_UART (port 1) |
Table 4-44 summarizes the UART pin configuration done by ROM code for UART host on port 0.
| Device Pin | Module Signal | Pull Enable | Pull Direction | Driver Index | Rx En/Dis | Tx En/Dis | Pinmux Sel |
|---|---|---|---|---|---|---|---|
| WKUP_GPIO0_12 | MCU_UART_TXD | Enable | Up | 0 | Disable | Enable | 0 |
| WKUP_GPIO0_13 | MCU_UART_RXD | Enable | Up | 0 | Enable | Disable | 0 |
Table 4-45 summarizes the UART pin configuration done by ROM code for UART host on port 1.
| Device Pin | Module Signal | Pull Enable | Pull Direction | Driver Index | Rx En/Dis | Tx En/Dis | Pinmux Sel |
|---|---|---|---|---|---|---|---|
| WKUP_UART_TXD | WKUP_UART_TXD | Enable | Up | 0 | Disable | Enable | 0 |
| WKUP_UART_RXD | WKUP_UART_RXD | Enable | Up | 0 | Enable | Disable | 0 |