UART TX
From SpecNext official Wiki
| Number | $133B |
|---|---|
| Decimal | 4923 |
| Short desc. | Sends byte to serial port. If read, tells if data in RX buffer |
| Bit Mask | %0001 0011 0011 1011 |
| Readable | Yes |
| Writable | Yes |
| Subsystem | UART |
Write:
- send a byte to the connected device. There is no Tx buffer so the program must make sure the last transmission is completed before sending another byte.
Read:
- bit 2 = 1 if the read buffer is full
- bit 1 = 1 if the transmitter is busy sending a byte
- bit 0 = 1 if the read buffer contains received bytes