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M/3SOO
3)
Data
input
control
RCV
Command nstruction
(
ER.RX
DISLN)
8251
AC
8251
AC
/Error
reset
\
\Data
input
disable/
Read
one
data
/Clears
the
data before
N
Vthe
start
of the
receive
command
/
Command
instruction
(RXEN,UTR,TXEN)
-
8251
AC
8251
AC
, N
/
Data
input
enabled
(
Data
output
enabled (echo-back,
selected)
\" L
"-»DTR
Waits
for NMI by
the
RXRDY signal
Resets
error
by
setin
DTR
high
Command
instruction
( tK >
8251
AC
ERROR
ERROR
-
74
-