34.20.1 UxCON0
Note:
- Changing the UART MODE while
ON =
1may cause unexpected results. - Clearing TXEN or RXEN will not clear the corresponding buffers. Use TXBE or RXBE to clear the buffers.
- ABDEN is read-only when MODE
>
‘b0111. - Full-featured UARTs only.
| Name: | UxCON0 |
| Address: | 0x1B9,0x1CD |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| BRGS | ABDEN | TXEN | RXEN | MODE[3:0] | |||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bit 7 – BRGS Baud Rate Generator Speed Select
| Value | Description |
|---|---|
| 1 | Baud Rate Generator is high speed with 4 baud clocks per bit |
| 0 | Baud Rate Generator is normal speed with 16 baud clocks per bit |
Bit 6 – ABDEN Auto-Baud Detect Enable(3)
| Value | Description |
|---|---|
| 1 | Auto-baud is enabled. Receiver is waiting for Sync character
(0x55). |
| 0 | Auto-baud is not enabled or auto-baud is complete |
Bit 5 – TXEN Transmit Enable Control(2)
| Value | Description |
|---|---|
| 1 | Transmit is enabled. TX output pin drive is forced on when transmission is active and is controlled by PORT TRIS control when transmission is Idle. |
| 0 | Transmit is disabled. TX output pin drive is controlled by PORT TRIS control. |
Bit 4 – RXEN Receive Enable Control(2)
| Value | Description |
|---|---|
| 1 | Receiver is enabled |
| 0 | Receiver is disabled |
Bits 3:0 – MODE[3:0] UART Mode Select(1)
| Value | Description |
|---|---|
| 1111 - 1101 | Reserved |
| 1100 | LIN Host/Client mode(4) |
| 1011 | LIN Client Only mode(4) |
| 1010 | DMX mode(4) |
| 1001 | DALI Control Gear mode(4) |
| 1000 | DALI Control Device mode(4) |
| 0111 - 0101 | Reserved |
| 0100 | Asynchronous 9-bit UART Address mode. 9th bit: 1 =
address, 0 = data |
| 0011 | Asynchronous 8-bit UART mode with 9th bit even parity |
| 0010 | Asynchronous 8-bit UART mode with 9th bit odd parity |
| 0001 | Asynchronous 7-bit UART mode |
| 0000 | Asynchronous 8-bit UART mode |