Receive config registers
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0280 | | | | | | |RIR| | | | | | | | | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0282 | | | | | | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0284 | "0004"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0286 | "0021"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0288 | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x028A | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x028C | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x028E | ? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x0290 | ? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
...
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x029E |RE | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
RIR: enable IRQ for receive if 1
RE: enable receive if 1
Transmit config registers
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02A0 | | | | | | |TIR| | | | | | | | | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02A2 | | | | | | | <- clock related, "1004"
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02A4 | "0004"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02A6 | "0021"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02A8 | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02AA | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02AC | "0000"? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02AE | ? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02B0 | ? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
...
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02BE |RT | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
TIR: enable IRQ for transmit if 1
TE: enable transmit if 1
Receive/transmit status and data registers
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02C0 | |RF | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02C2 | |TE |TF | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02C4 | FIFO_RECEIVE |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02C6 | FIFO_TRANSMIT |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02C8 | ? |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
|+0x02CA | |FL | |
+-----------#---+---+---+---#---+---+---+---#---+---+---+---#---+---+---+---#
RF: 1 if receive buffer is full
TF: 1 if receive buffer is full
TE: 1 if receive buffer is empty
FL: Application spin waits on this flag