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Chapter 3
Parallel Port Interface (J16)
Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The LPC47B272
provides separate parallel port interface signals not shared with the floppy drive signals.
The parallel connector has 26 pins, 2 rows, odd/even, (1, 2), with 0.100" pin spacing.
Table 3-13. Parallel Interface Pin/Signal Descriptions (J16)
Pin # Signal
1
Strobe*
2
AFD*
3
PD0
4
ERR*
5
PD1
6
INIT*
7
PD2
8
SLIN
9
PD3
10, 12 GND
11
PD4
13
PD5
14, 16 GND
15
PD6
17
PD7
18, 20 GND
19
ACK*
21
BUSY
22, 24 GND
23
PE
25
SLCT
26
Key/NC
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
40
In/Out Description
Out
Strobe* – This is an output signal used to strobe data into the printer.
I/O pin in ECP/EPP mode.
Out
Auto Feed* – This is a request signal into the printer to
automatically feed one line after each line is printed.
I/O
Parallel Port Data 0 – These pins (0 to 7) provide parallel port data.
Out
Error* – This is a status output signal from the printer. A Low State
indicates an error condition on the printer.
I/O
Parallel Port Data 1 – Refer to pin-3 for more information.
Out
Initialize* – This signal used to Initialize printer. Output in standard
mode, I/O in ECP/EPP mode.
I/O
Parallel Port Data 2 – Refer to pin-3 for more information.
Out
Select In – This output signal is used to select the printer. I/O pin in
ECP/EPP mode.
I/O
Parallel Port Data 3 – Refer to pin-3 for more information.
Ground
I/O
Parallel Port Data 4 – Refer to pin-3 for more information.
I/O
Parallel Port Data 5 – Refer to pin-3 for more information.
Ground
I/O
Parallel Port Data 6 – Refer to pin-3 for more information.
I/O
Parallel Port Data 7 – Refer to pin-3 for more information.
Ground
In
Acknowledge* – This printer output status indicates it has received
the data and is ready to accept new data if the signal state is Low.
In
Busy – This printer output status indicates the printer is not ready to
accept data if the signal state is High.
Ground
In
Paper End – The printer output status indicates the printer is out of
paper if the signal state is High.
In
Select – This printer output status indicates the printer is selected
and powered on if the signal state is high.
Key - Not connected
Reference Manual
Hardware
LittleBoard 800
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