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Chapter
6
Registers
S13, S14,
and S15 can be used
for
program
review of
modem
status.
The
information
is
rendered
in
byte
form
with
each
bit
being defined
as follows.
S13
UART
Status
Bit
Value
Description
-
not used
*
1
1
Extended
Result
Codes
disable
Extended
Result
Codes
Set
2
1
Parity
Disabled
Parity
Enabled
3
1
Odd
Parity
Even
Parity
4
1
7
Data
Bits/word
8
Data
bits/word
5
-
not used
*
6
1
Buffer overflow
flag
(causes
ERROR
result
code
to
be
sent)
7
8th data
bit set
to
space
(if
bit
4=1)
1
8th data
bit set
to
mark
(if
bit
4=1)
*
unused
bits
may
be
or
1
at
random
6-12
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