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Author Topic: help with LCD display CCM1620  (Read 5555 times)
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nacho1
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« on: November 02, 2007, 02:44:46 02:44 »

Hu guys I'm trying to use a 16x2  lcd module a cmm1620csl from casil semiconductor in 8 bit comunication.  i have these problems, first I cant Initialize the display, but i've found the datasheet and solve it by the software init. and the second problem came when i set the cursor at the second line, the cursor sets ok, but i cant write a character on the display.then if i set the cursor in the first line  i can.
i need some tip, because it's drivingme crazy
thanks
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sohel
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« Reply #1 on: November 03, 2007, 11:36:39 11:36 »

please show ur design.  Huh
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nacho1
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« Reply #2 on: November 03, 2007, 06:18:11 18:18 »

Hi Sohelin this link is the connection 'ive made. i use a pic16f877 to drive the display the portE is connected to the control bits and the portD to the data bits.

http://roboticsindia.com/public/images/lcd/lcd.gif

i can:
initialize & clear the dsiplay
change the cursor to any position in the first row & write
can write all the LCD memory. fills the screen (2 rows) with the same caracter
set the cursor in any position in the second row and came back to the first row

i can't:
set the cursor in the secon row & write a character in that position

The data sheet tell me thah is 100% compatible whit the HITACHI HD44780. and thats not true,
because i've change the response timings to initialise & write.
i really don't know what to do, i've tried  everithing .
thanks
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