| Online Development Notebook > Index > ODN > Raw Device Programming > 01 - WriteACmd |
Command #01 - WriteACmd
Description:
Write a byte value to port A. The possible values range from 0-255 (00h to FFh).
Command Format:
| Byte Number | Description |
| 0 | 01h: WriteACmd |
| 1 | Byte Data - This byte is written to port A, D0 - D7 The most significant bit of the byte value is written to D7 |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
Command Format Details:
Byte 0 contains the command. Byte 1 contains the data to write to port A. Byte 2 through byte 7 are unused.
Response Format:
| Byte Number | Description |
| 0 | 01h: WriteACmd |
| 1 | <not used> |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
Response Format Details:
Byte 0 contains the command. Byte 1 through byte 7 are unused.
Example Usage:
Writing a E7h to port A with the command 01-E7-00-00-00-00-00-00 will set A.7, A.6, A.5, A.2, A.1, and A.0 high and will set lines A.4 and A.3 low, assuming that they are configured as outputs.
| Hardware: U401 USB Interface U421 USB Interface |
| Programming: USBm DLL Programming Download Files |
| Application Notes: U4x1 Application Notes Misc Applications and Information FAQ |