Rev. 3.0, 03/01, page 32 of 390
Table 4.9
Pin Descriptions of Printer Port Interface
Pin No.
(HD64465BP)
Pin No.
(HD64465BQ) Symbol
I/O
Description
Printer Interface
D10
A7
STB#
O
Printer Strobe. Active low, this signal is the
complement of bit 0 of the printer control
register. It is used to strobe the printer data
into the printer
C10
G9
AFD#
O
Printer Autofeed. Active low, this signal is the
complement of bit 1 of the printer control
register. This signal, when in low level, is
used to feed one line after each line is
printed when it is low.
B10
B8
ERR#
I
Printer Error. Active low, indicates printer has
encountered an “ERROR” condition. It can
be read at bit 3 of printer status register
A10
E9
INIT#
O
Printer Initialize. Active low, this signal is bit 2
of the printer control register, and is used to
initiate printer when it is low.
B8
E8
SLIN#
O
Printer Select. Select the printer when it is
low, this signal is the complement of bit 3 of
the printer control register
A8
B6
ACK#
I
Printer Acknowledge. This signal goes low to
indicate that the printer has already received
a character and is ready to accept another
D9
A6
BUSY
I
Printer Busy. This signal goes high when the
line printer has a local operation in process
and cannot accept data
C9
C7
PE
I
Printer Paper End. This signal is set high by
printer when it runs out of paper
B9
B7
SLCT
I
Printer Select. This signal goes high when
the line printer has been selected
B7, D7-8, C8,
D11, C11,
B11, D12
D7, C6, F8,
A5, F9, C8,
A8, B9
PPD7-PPD0
IO
Parallel Port Data Bus. This bus provides a
byte-wide input or output to the system. The
eight lines are held in a high-impedance
state when the port is not selected.
Summary of Contents for HD64465
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