Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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HI ericgibbs;
Thanks for your reply..ok...may i ask that, is it possible if i create 1 library in my ROM with address $B600?? which is
eg. Y1,X1 =1 in my key pad,
so i store this equilvalent in my library... and then if the MCU detect this X1,Y1, according to the the truth table is [A=0...
Thanks bananasiong your speedy reply...After discuss with you just now, I have understand your concept about to sent bit out and detect any switch hass been press.. and I have went thru the data sheet of this IC which i have asked you early lah, I have found that the above problem occur, just i...
Hi All:
..According to above Tittle, I am building an 4X4 keypad with use of IC MM74C922 base on Motorola 68HC11 microcontroller. from the cct diagram below, ,
and after i have read throught about the truth table, and i wish to merch it with my keypad but i found that my matrix keypad which i...
Thanks ericgicbbs ur reply I hv download the above datasheets so may i know that do it possible if i connect the Port C (PC0 - PC3) to the IC MM74C922?
thanks for 3v0 reply and i now have an Idea about it, this is the diagram of 68HC11 organisation after i hv got the idea from 3v0, i wish to do this following jobs if i apply the Port C (Bi-directional I/O) with use of the IC MM74C922N which the diagram of bottom, do it make sense?
HI all,
I would like to build a hardware - 4X4 matrix keypad with use of IC MM74C922 base on Motorolla 68HC11 microcotroller, but I have no idea about the circuit design and the program, i wish everyone in this forum whose had experiance in this can help me and give any resources ...Thanks
HI all,
I would like to build a hardware - 4X4 matrix keypad with use of IC MM74C922 base on Motorolla 68HC11 [/COLOR]microcotroller, but I have no idea about the circuit design and the program, i wish everyone in this forum whose had experiance in this can help me and give any resources...
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