We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
After connecting external keypad and display to ARM7 MCB2140,is there any software application to be loaded or executed to make it operate???
See: http://www.keil.com/forum/docs/thread14763.asp
Are you guys all doing the same assignment?
while interfacing the 4x4 keypad and 16x2 lcd with mcb2140(keil board with lpc2148) do we need any external components like resistors,transistors and capacitors.
Yes Mr.Andy Neil, we are in project with ARM7 Board. we have to interface ext keypad and display to it.
Again, look at the Datasheet for the processor, the schematics for the board, and the datasheets for the peripherals (keypad, LCD) - those documents tell you all you need to know!
So, rather than all posting the same question individually, wouldn't it be more sensible to get together and think about it together?
See: www.8052.com/.../160143
Have you read the datasheet for the processor, in regards to the possibility of using built-in pull-up or pull-down in the processor? Note that internal pull-up/pull-down is normally quite weak and is good to hold PCB-internal signals at a known state while the processor boots, but signals for a keyboard or anything that leaves the PCB should be driven a bit harder, to give better electrical protection from ESD or external interference.