21.5.22 Loopback Control Register
| Bit Number | Name | Reset Value | Description |
|---|---|---|---|
| [31:4] | Reserved | 0 | |
| 3 | MSS_GPIOLOOPBACK | 0 | Controls whether internal loopback on the MSS GPIO is enabled. Allowed values: 0: No internal loopback 1: MSS GPIO outputs are looped back to MSS GPIO inputs |
| 2 | MSS_I2CLOOPBACK | 0 | Controls whether internal loopback between I2C_0 and I2C_1 is enabled. Allowed values: 0: No internal loopback 1: Traffic from I2C_0 is looped back to I2C_ and vice versa |
| 1 | MSS_SPILOOPBACK | 0 | Controls whether internal loopback between SPI_0 and SPI_1 is enabled. Allowed values: 0: No loopback 1: SPI_0 Tx is looped back to SPI_1 Rx. SPI_1 Tx is looped back to SPI_0 Rx |
| 0 | MSS_MMUARTLOOPBACK | 0 | 0: No loopback between MMUART_0 and MMUART_1 1: MMUART_0 Tx is looped back to MMUART_1 Rx MMUART_1 Tx is looped back to MMUART_0 Rx |
Note: Do not change these register fields dynamically for 005 and 010 devices, see System Registers Behavior for M2S005/010 Devices.