AY0438 Display Driver

[tallen]

I have a Glass type display with a Microchip AY0438 display driver. I found the assembly code for this chip on Microchips site, but I'm bot very good with assembly. Can anyone offer a code example of how to use this chip with PBP? I have used the LCDOUT comand with the 44780 type displays, but i have not used this type of display before.

Thanks,

Terry

[mark_s]

I have a Glass type display with a Microchip AY0438 display driver. I found the assembly code for this chip on Microchips site, but I'm bot very good with assembly. Can anyone offer a code example of how to use this chip with PBP? I have used the LCDOUT comand with the 44780 type displays, but i have not used this type of display before.

Thanks,

Terry

Hi Terry,

I used the shiftout command. Sorry I don't have an example on this
PC. I will look for some code I have and post it later.

Mark

[rsocor01]

tallen,

Yes, I have used this chip before. The LCDOUT command is for alphanumeric LCD displays, for example a 16x2 characters display. This chip AY0438 is to drive 7-segments LCD displays. What type of display do you want to drive?

Robert

[tallen]

Its a 7 seg LCD that has a Microchip AY0438 driver with it.

Terry

[rsocor01]

Its a 7 seg LCD that has a Microchip AY0438 driver with it.

Terry

Then, you need to look at the datasheet of the LCD with the AY0438 in it. Look at figure 4 of the AY0438 datasheet. This figure shows you how to control the 32 segments. If I remember correctly, you have to connect the LCD(Phi) to the clocking signal for it to work. How many digits does the LCD have?




Robert

[mark_s]

Its a 7 seg LCD that has a Microchip AY0438 driver with it.

Terry

Terry,

Try this code. It is for a 4 digit seven segment display.

Mark

[tallen]

i'm struggling with this code. It is a 4 digit 7 segment display. The display just seems to roll continiously very fast. I put in a pause to slow it down. I removed the "IF Total = 9999 then Temp = 0" and the "Temp=Temp+1. I put it TEMP = 1234 hoping to dispaly 1234, but all I see is just jumbled up numbers. I put in TEMP = 1 and see PPP. As you can Tell I don't understand this lookup and shiftout code. Any Ideas?

Thanks,

Terry