8.1.12 SPI Read Fuse
Reads fuses using SPI programming.
| Field | Size | Description |
|---|---|---|
| SPI_CMD_READ_FUSE | 1 byte | Command ID |
| RetAddr | 1 byte | XML: pollIndex. Return address |
| cmd1 | 1 byte | Command Byte # 1 to be transmitted |
| cmd2 | 1 byte | Command Byte # 2 to be transmitted |
| cmd3 | 1 byte | Command Byte # 3 to be transmitted |
| cmd4 | 1 byte | Command Byte # 4 to be transmitted |
Note: RetAddr indicates which of the transmitted bytes on the SPI interface contains the
return value, since the SPI interface is implemented as a ring buffer (one byte in, one
byte out).
Response:
| Field | Size | Description |
|---|---|---|
| SPI_CMD_READ_FUSE | 1 byte | Command ID |
| Status1 | 1 byte | SPI_STATUS_CMD_OK |
| Data | 1 byte | Data read from the device |
| Status2 | 1 byte |
SPI_STATUS_CMD_OK or SPI_STATUS_RDY_BSY_TOUT |