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233
Serial Controller Module
D15 R/W RTSTX 0 Enable active RTS only while transmitting
Note: The RTS bit in Serial Channel Control
Register A must be set if setting this
bit.
Controls the RTS indicator. Do not set this bit
if the RTSRX bit in Serial Channel Control
Register A is set.
When this bit is set, the RTS output goes
active only when the transmitter is actively
sending a transmit character. The RTSTX bit
allows external hardware to use the RTS signal
as a transmit line driver enable signal in
multi-drop applications.
D14:12 N/A Reserved N/A N/A
D11:09
D08:06
R/W
R/W
TENC
RDEC
0
0
Transmit encoding
Receive data encoding
The NS7520 can be programmed to encode
and decode the serial data stream using one of
the eight methods listed here. The transmit
and receive coding methods can be selected
independently in the transmitter and receiver.
NRZ (000): Default. A 1 is represented by
a high level for the duration of the entire
bit-time; a 0 is represented by a low level
during the entire bit-time.
NRZB (001). NRZB is NRZ inverted; that
is, a 1 is represented by a low level during
the entire bit-time and a 0 is represented
by a high level during the bit-time.
NRZI-Mark (010). A 1 is represented by a
transition at the beginning of the bit-time;
the level that appears during the previous
cell is reversed. A 0 is represented by the
absence of a transition at the beginning of
the bit cell.
Bit Access Mnemonic Reset Description
Table 88: Serial Channel Control Register B bit definition