DESCRIPTION OF PIN FUNCTIONS
BUFFER
QFP/
TQFP
PIN NO.
TYPE
NAME
SYMBOL
DESCRIPTION
73
nPrinter Select
Input
nSLCTIN
OD24
This active low output selects the printer. This
is the complement of bit 3 of the Printer
Control Register.
Refer to Parallel Port description for use of this
pin in ECP and EPP mode.
0P24
74
76
nInitiate Output
nINIT
OD24
This output is bit 2 of the printer control
register. This is used to initiate the printer
when low.
Refer to Parallel Port description for use of this
pin in ECP and EPP mode.
0P24
nAutofeed Output nAUTOFD
OD24
This output goes low to cause the printer to
automatically feed one line after each line is
printed.
The nAUTOFD output is the
complement of bit 1 of the Printer Control
Register.
Refer to Parallel Port description for use of this
pin in ECP and EPP mode.
0P24
77
nStrobe Output
nSTROBE
OD24
An active low pulse on this output is used to
strobe the printer data into the printer. The
nSTROBE output is the complement of bit 0 of
the Printer Control Register.
Refer to Parallel Port description for use of this
pin in ECP and EPP mode.
0P24
61
62
Busy
BUSY
nACK
I
This is a status output from the printer, a high
indicating that the printer is not ready to
receive new data. Bit 7 of the Printer Status
Register is the complement of the BUSY input.
Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
nAcknowledge
I
A low active output from the printer indicating
that it has received the data and is ready to
accept new data. Bit 6 of the Printer Status
Register reads the nACK input. Refer to
Parallel Port description for use of this pin in
ECP and EPP mode.
11
SMSC [ SMSC CORPORATION ]
