CD2481 Datasheet, PDF (133/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

Programmable Four-Channel Communications Controller — CD2481
Bits 4:3
Bits 2:0
IgnCr
1
1
1
ICrRNL
0
1
1
INLCR
1
0
1
CR discarded and NL translated to CR
CR discarded
CR discarded and NL translated to CR
Break Action – These bits determine the action taken after a break condition is
received.
IgnBrk
0
0
1
1
NBrkInt
0
1
0
1
Generate an exception interrupt
Translate to a NULL character
Reserved
Discard character
Parity/framing error actions – These bits determine the action taken when a parity or
framing error is received.
Following the generation of a break-exception interrupt, a receive exception inter-
rupt is generated with RET bit (RISRl) set, when the end of break is detected. The
RET interrupt must be enabled in IER to enable this feature.
ParMrk
0
0
0
0
1
1
1
1
INPCK
0
0
1
1
0
0
1
1
ParInt
0
1
0
1
0
1
0
1
Generated an exception interrupt
Translated to a NULL character
Ignore error; character passed on as
good data
Discard error character
Reserved
Translate to a sequence of FF NULL
and the error character and pass on as
Good Data
Reserved
Reserved
When ParMrk = 1 and ParInt = 1, each occurrence of FF hex in the data stream is
preceded by FF hex to distinguish it from a parity error sequence.
Datasheet
133