Can anyone give me any application notes/links which will help me to understand the uC and LCD (or uC and LCD controller) interfacing ?
uC and LCD (or uC and LCD controller) interfacing
Started by ●August 21, 2007
Reply by ●August 21, 20072007-08-21
On Aug 21, 6:58 pm, Ajab <jasusvi...@yahoo.com> wrote:> Can anyone give me any application notes/links which will help me to > understand the uC and LCD (or uC and LCD controller) interfacing ?www.avrfreaks.net search Projects with LCD keyword. ali
Reply by ●August 21, 20072007-08-21
On Tue, 21 Aug 2007 03:58:34 -0700, Ajab wrote:> Can anyone give me any application notes/links which will help me to > understand the uC and LCD (or uC and LCD controller) interfacing ?Have you done web searches? An LCD segment turns dark (or light) when you apply voltage, and will get stuck that way if the voltage stays on. So an LCD controller applies a square wave to the segments you want to turn on -- that's a big part of the reason you need a controller instead of just logic and some resistors. Generally you only connect a micro directly to an LCD if the micro has an LCD controller built in. An LCD controller usually has an interface that makes it look like memory. You write the correct commands and data to it, and it does what you want. -- Tim Wescott Control systems and communications consulting http://www.wescottdesign.com Need to learn how to apply control theory in your embedded system? "Applied Control Theory for Embedded Systems" by Tim Wescott Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
Reply by ●August 21, 20072007-08-21
If you are thinking about a text only LCD I have done an interface to the MicroBlaze uC. Find out more from my blog: http://svenand.blogdrive.com/archive/62.html (Part 31-36) Sven
Reply by ●August 21, 20072007-08-21
On Aug 21, 7:15 am, Tim Wescott <t...@seemywebsite.com> wrote:> On Tue, 21 Aug 2007 03:58:34 -0700, Ajab wrote: > > Can anyone give me any application notes/links which will help me to > > understand the uC and LCD (or uC and LCD controller) interfacing ? > > Have you done web searches? > > An LCD segment turns dark (or light) when you apply voltage, and will get > stuck that way if the voltage stays on. So an LCD controller applies a > square wave to the segments you want to turn on -- that's a big part of > the reason you need a controller instead of just logic and some resistors.Actually, you can do it with logics and DC/DC converters. I am driving an LCD panel by toggling port pins only, but it's using up all the micro processing power. So, in theory, you can build an LCD controller with standard CPLD, FPGA or ASIC. For high volume, ASIC w/ dumb uC might be cheaper than LCD uC.
Reply by ●August 21, 20072007-08-21
Ajab <jasusvijay@yahoo.com> wrote:>Can anyone give me any application notes/links which will help me to >understand the uC and LCD (or uC and LCD controller) interfacing ?Text LCDs have an HD44780 control chip. These are easy to interface, but text is all they can display. "Dumb" ECM-A0526 640x480 graphic LCD driven by a 48 MHz PIC (and apparently nothing else!): http://tim.cexx.org/projects/lcd/ "Dumb" ECM-A0526 640x480 graphic LCD driven by a PIC, some dynamic ram (DRAM), and a few other chips: http://www.nyx.net/%7Ejpurbric/lcd/ ATmega8 microprocessor driving a semi-intelligent (KS0108 controller chip) PVG120602EGE 128x64 graphic LCD: http://www.attiny.com/graph.htm AVR CPU driving an intelligent (SED1330 controller chip) graphic LCD: http://www.microsyl.com/graphlcd/graphlcd.html Lots of LCD code for PIC microprocessors: http://www.sxlist.com/techref/io/lcd/pic.htm Atmega 16 CPU, T6963C intelligent controller: http://www.8052.com/codelib/T6963C-Ver3.rar
Reply by ●August 21, 20072007-08-21
Ajab wrote:> Can anyone give me any application notes/links which will help me to > understand the uC and LCD (or uC and LCD controller) interfacing ?perhaps a complete solution may suit you: http://www.dontronics-shop.com/home.php?cat=263 Don... -- Don McKenzie Site Map: http://www.dontronics.com/sitemap E-Mail Contact Page: http://www.dontronics.com/email No More Damn Spam: http://www.wizard-of-oz.com Serial OLED uses standard micro-SD memory cards. http://www.dontronics-shop.com/product.php?productid=16659 USB Flash Drive interface for existing products. http://www.dontronics-shop.com/product.php?productid=16654
Reply by ●August 21, 20072007-08-21
On Tue, 21 Aug 2007 08:54:15 -0700, linnix wrote:> On Aug 21, 7:15 am, Tim Wescott <t...@seemywebsite.com> wrote: >> On Tue, 21 Aug 2007 03:58:34 -0700, Ajab wrote: >> > Can anyone give me any application notes/links which will help me to >> > understand the uC and LCD (or uC and LCD controller) interfacing ? >> >> Have you done web searches? >> >> An LCD segment turns dark (or light) when you apply voltage, and will get >> stuck that way if the voltage stays on. So an LCD controller applies a >> square wave to the segments you want to turn on -- that's a big part of >> the reason you need a controller instead of just logic and some resistors. > > Actually, you can do it with logics and DC/DC converters. I am > driving an LCD panel by toggling port pins only, but it's using up all > the micro processing power. So, in theory, you can build an LCD > controller with standard CPLD, FPGA or ASIC. For high volume, ASIC w/ > dumb uC might be cheaper than LCD uC.There are dedicated LCD controllers out there, both big and little. I'm currently using a small graphics LCD panel; the only data sheet I refer to is the one for the driver. That ought to be even cheaper than an ASIC for all but the highest of volumes. -- Tim Wescott Control systems and communications consulting http://www.wescottdesign.com Need to learn how to apply control theory in your embedded system? "Applied Control Theory for Embedded Systems" by Tim Wescott Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
Reply by ●August 21, 20072007-08-21
On Aug 21, 4:18 pm, Tim Wescott <t...@seemywebsite.com> wrote:> On Tue, 21 Aug 2007 08:54:15 -0700, linnix wrote: > > On Aug 21, 7:15 am, Tim Wescott <t...@seemywebsite.com> wrote: > >> On Tue, 21 Aug 2007 03:58:34 -0700, Ajab wrote: > >> > Can anyone give me any application notes/links which will help me to > >> > understand the uC and LCD (or uC and LCD controller) interfacing ? > > >> Have you done web searches? > > >> An LCD segment turns dark (or light) when you apply voltage, and will get > >> stuck that way if the voltage stays on. So an LCD controller applies a > >> square wave to the segments you want to turn on -- that's a big part of > >> the reason you need a controller instead of just logic and some resistors. > > > Actually, you can do it with logics and DC/DC converters. I am > > driving an LCD panel by toggling port pins only, but it's using up all > > the micro processing power. So, in theory, you can build an LCD > > controller with standard CPLD, FPGA or ASIC. For high volume, ASIC w/ > > dumb uC might be cheaper than LCD uC. > > There are dedicated LCD controllers out there, both big and little. I'm > currently using a small graphics LCD panel; the only data sheet I refer to > is the one for the driver. That ought to be even cheaper than an ASIC for > all but the highest of volumes.We are currently using the LCD AVR, but $4 @10K is kind of expensive. A dumb AVR is less than $1.5. I think we can add LCD function to an ASIC for less than $1, given that we need an ASIC anyway.> > -- > Tim Wescott > Control systems and communications consultinghttp://www.wescottdesign.com > > Need to learn how to apply control theory in your embedded system? > "Applied Control Theory for Embedded Systems" by Tim Wescott > Elsevier/Newnes,http://www.wescottdesign.com/actfes/actfes.html
