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chotobu
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PostPosted: Thu Jan 04, 2007 21:25 
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Joined: Wed Jan 03, 2007 9:58
Posts: 6
I don't remember, that the LPT has so many controlpins. I preffer RS232 ;-)

The D/I Pin is equal to the R/S signal on HD44780, and all signals are high active on this device.
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washburn_it
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PostPosted: Thu Jan 04, 2007 23:37 
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Joined: Sat Jul 08, 2006 17:49
Posts: 25
Well...the serial port is easier to manage from the software "side" but you always need an extra circuit to drive a device through it.
With the parallel port you can drive a LCD directly.
It's a matter of tastes I think :wink:

Regards,

Bob
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jmv_driver
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PostPosted: Fri Jan 05, 2007 0:36 
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Joined: Mon Oct 10, 2005 20:56
Posts: 7
washburn_it wrote:
The parallel port gives you 12 pins to drive a LCD display: 8 for data lines, 4 for control pins.

DB0-DB7 ---> parallel port data lines (2 to 9 of the parallel port)
CS1,CS2 ---> pin 1,14 of the parallel port
EN ---> pin 16 of the parallel port
R/W ---> to GND (you can only send data but not read from the display)
D/I ---> pin 17 of the parallel port

Reset ---> can be driven individually by a button

Remarks: pin 1,14,17 are active low, pin 16 is active high.

The pin D/I actually I don't know what is its function but if it's a control pin for the display can be driven by the parallel port.

Regards,

Bob


thanks for the reply guys can i put the lcd work in this way or te chip that i have is impossible to connect? i'm confused :oops: my english is bad :lol: i'm from portugal :)

regards

JMV
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chotobu
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PostPosted: Fri Jan 05, 2007 2:14 
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Joined: Wed Jan 03, 2007 9:58
Posts: 6
washburn_it wrote:
Well...the serial port is easier to manage from the software "side" but you always need an extra circuit to drive a device through it.
With the parallel port you can drive a LCD directly.
It's a matter of tastes I think :wink:

Regards,

Bob


That's right. I work with Microcontrollers so its easy for me :-)

Quote:
thanks for the reply guys can i put the lcd work in this way or te chip that i have is impossible to connect?


YES, you can use it with a PC. But i think you will need a softwaredriver.
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jmv_driver
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PostPosted: Fri Jan 05, 2007 11:24 
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Joined: Mon Oct 10, 2005 20:56
Posts: 7
is any program that supports this lcd...? or where can i find the driver to use it? :) i am noob with lcd's :lol:

[[[]]]]

jmv
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