User`s manual
Bit(s)
09,10
11,12
13
14
15
09,10
11-14
Designation
Table 3-4
(Cont)
Line Control Register Bit Assignments
(F
or Asynchronous Line Cards)
Function
Asynchronous Line
Card Format Register
Format Register
Selection
Code 10
Character
Length
Two
Stop Bits
Parity Enable
Control Strobe
For the line number selected by SRS
00-03,
the
code
of
10 specifies writing into the Format
register at LCR
15
set time. LCR 09 = 1,
LCR
10 =
O.
These bits are set to transmit and receive characters
of
the length (excluding parity)
as
shown below.
12
II
Selected Character Length
0
0
5 bits
0 6 bits
0 7 bits
1 8 bits
This bit, when set, conditions the line transmitting
with
5,6,
7, or 8 bit code to transmit characters
having two stop bits.
One stop bit
is
sent when this
bit
is
cleared.
If this bit
is
set, characters transmitted on the line
have an appropriate parity bit affixed, and charac-
ters received on the line have parity checked. Parity
sense
is
determined by the state
of
Primary Register
bit 12.
When
set
to
a one, strobes the Format register bits
11, 12, 13, 14 into storage for the line specified
in
SRS
00-03,
then clears itself.
May
be set at the
same
time as the bits that it strobes into storage.
Asynchronous Line
Card Baud Rate Register
Baud Rate
Register
Selection
Code
01
Speed Code
For the line number selected by SRS
00-03,
the
code
of
01
specifies writing into the Baud Rate
register at LCR
15
set time. LCR 09 =
0,
LCR
10
=
1.
The state
of
these bits determine the operating
speed for the transmitter and receiver
of
the
selected line.
3-18
Read/Write
Write
Write
Write
Write
Write
Write
Write