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Title:

THE PARALLEL PORT

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THE PARALLEL PORT Understanding the parallel port Why use the parallel port You can do amazing varieties of projects using the parallel port. We have interfacing ... – PowerPoint PPT presentation

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Title: THE PARALLEL PORT


1
THE PARALLEL PORT
  • Understanding the parallel port

2
Why use the parallel port
  • You can do amazing varieties of projects using
    the parallel port.
  • We have interfacing expectations to cover.
  • It is simple to understand and use.
  • Available on most PCs in the school.
  • It is challenging, engaging and fun.

3
Understanding the Parallel Port
4
Parallel Port - Output
D7 D6 D5 D4 D3 D2 D1 D0
5
Parallel Port - Output
128 64 32 16 8 4 2 1
27 26 25 24 23 22 21 20
D7 D6 D5 D4 D3 D2 D1 D0
Note Read 20 as 2 raised to the power of 0
6
Parallel Port - Output
128 64 32 16 8 4 2 1
27 26 25 24 23 22 21 20
D7 D6 D5 D4 D3 D2 D1 D0
  • parallelput(0)
  • parallelput(5)
  • parallelput(42)
  • Parallelput(255)

0 0 0 0 0 0 0 0
0 0 0 0 0 1 0 1
0 0 1 0 1 0 1 0
1 1 1 1 1 1 1 1
7
Parallel Port - Input
Status Lines (S) used for input
S4 S3 S2 S1
S5
Ground
8
Parallel Port - Input
Status Lines (S) used for input
56
56
S4 S3 S2 S1
S5
Ground
  • Lets take pin 10 (S1) and pin 18 (ground)
  • If we connect them using a push button or
    joystick .
  • The computer will generate a unique value
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