Jameco Electronics Rabbit 3000 - Manual (Page 187)

178 Rabbit 3000 Microprocessor
Table 12-19. Extended Register HDLC Mode (Ports E and F only)
Serial Port x Extended Register (SEER) (Address = 0xCD)
(SFER) (Address = 0xDD)
Bit(s) Value Description (HDLC mode only)
7:5
000 NRZ data encoding for HDLC receiver and transmitter.
010 NRZI data encoding for HDLC receiver and transmitter.
100 Biphase-Level (Manchester) data encoding for HDLC receiver and transmitter.
110 Biphase-Space data encoding for HDLC receiver and transmitter.
111 Biphase-Mark data encoding for HDLC receiver and transmitter.
4
0 Normal HDLC data encoding.
1
Enable RZI coding (1/4th bit cell IRDA-compliant). This mode can only be used
with internal clock and NRZ data encoding.
3
0 Idle line condition is Flags.
1 Idle line condition is all ones.
2
0 Transmit Flag on underrun.
1 Transmit Abort on underrun.
1:0 xx These bits are ignored in HDLC mode.