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Forum Themes Elegant Mobile. Then, insert the control pin bit before displaying the value.
MrCal Note with the simplified schematic you dont need two latches, only one. I felt that if someone wanted to post detailed info then they can do so.
We are 74hc37 information to a newbe. BTW, using a short clock pulse works fine, try it. User Control Panel Log out.
74HC 데이터시트(PDF) – NXP Semiconductors
Hi again Paul, I was giving general information anyway as to the correction in the topology alone. As long as the information is accurate, why waist your time commenting on accurate information whose intent is to help others?
The outputs then remain fixed until the next rising edge on the clock pin. And, your “simplified schematic” is incomplete since it does not make use of the 74HC output-control pin, [pin-1], detailed below. The 74HC is identical, in operation, to the 74HC But, the 74HC has all datasneet inputs on one side, and all the output on the other. And, to be fair, my post is the only one that details the steps needed for a complete toggle.
If you want to include more datashet info you could also mention that with the two latches you do gain the ability to use the same PIC chip for other things too, maybe even another array of LEDs.
Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond This saves lots of wiring and one complete IC chip. Haven’t received registration validation E-mail? The designer displays one row at a time by setting one row bit low and the other row bits high in the row latch with the 8 bit LED data for that row latched datassheet the column latch.
74HC374 PDF Datasheet浏览和下载
MrCal Hello Paul, Apparently you dont read anyone elses post except your own: The data for the latch is only held valid for as long as needed too, then the data for the ‘segments’ resistored lines is presented to the output port to drive them properly AFTER the latched data has been loaded into the latch. Attached Image s 7. Stupidity often carries with it, its own death sentence. Essentials Only Full Version. That is why there is a seperate clock line from your PIC to each ‘ I think you also missed my little ‘smiley’.
For best explanation, why not start by reading the wikipedia article http: I would datsaheet the character patterns as used in a standard 7-segment display.
My favorate method is to use a seperate, very inexpensive 16FA to do nothing but input serial data, and output LCD data. Hello Paul, Apparently you dont read anyone elses post except your own: So you might use one table for how to display “0” to “9” for the first digit, and then a different table for the second digit Even if you multiplex at 60 x 12 updates per second, your PIC, using a 4MHz clock, should have plenty of time to format the output value.
Debug breakpoints automatically disabled.
Realizing I had a mistake in my previous post, I made the correctins at 2am, after returning from dinner, without reading any other posts. Forums Posts Latest Posts. Each ‘1’ bit in the column latch will light the LED in that column datasheeg the selected row.
I have corrected it. MrCal Hello there, Here is a simplified schematic which will do the same thing as long as the data from port B doesnt have to be used dataasheet anything else.
Things are not so easy when using ‘ chips. Hi simonwai Charlieplexing is an interesting trick for making the most out of a limited number of pins. This multiplexed display design would be relatively easy to use. Hi again, Note with the simplified schematic you dont need two latches, only one. IN code you will set up to do two write sequences: The two ‘s are using the same data-bus. You could have ten ‘s share the same data bus.
Your post offers vague, and incomplete, information. Whatever data is present on the inputs will be transferred and latched in the outputs when the clock switches from 0 to 1 a rising edge.
I detail how to do this in my prototyping board’s data sheet [including circuit and source code]. Hello; After my last post, I drove for over an hour to a family dinner.