74HC Datasheet, 74HC Octal D Flip-Flop Datasheet, buy 74HC 74HC Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC Semiconductors. Pin and function compatible with 74HC General operating conditions are specified to ensure optimal performance to the datasheet specifications.

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Hello Paul, Apparently you dont read anyone elses post except your own: Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond This saves lots of wiring and one complete IC chip.

Whilst we’re willing to help, we like people to use their own initiative as well, so it is assumed that people use google and wiki as well as the forum. That is why there is a seperate clock line from your PIC to each ‘ As long as the information is accurate, why waist your time commenting on accurate information whose intent is to help others?

74HC374 – Octal D-Type Flip-Flop Edge-Triggered Tri-State

IN code you will set up to do two write sequences: 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 for anything else. This means the first circuit is in no way voided completely.

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. For example, you could use a timer driven interrupt display driver that datashset update the display from an 8 byte array as a background task and the 8 byte array would have a direct relationship to the LEDs in the matrix.


I would save the character patterns as used in a standard 7-segment display. I thought about my last post. 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.

The way you are doing it, the 74hf374 output changes every time you load a new value into your PIC PortB.

If you want to include more detailed 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. I try to avoid multiplexed displays since your PIC ties up a lot of it’s time keeping the display on. I have datashewt it.

Forum Themes Elegant Mobile. Hi simonwai Charlieplexing is an interesting trick for making the most out of a limited number of pins.

74HC 데이터시트(PDF) – NXP Semiconductors

Hello; After my last post, I drove for over an hour to a family dinner. You could have ten ‘s share the same data bus. MrCal It is important however to keep the clock pulse for the latch as short as possible to prevent unwanted patterns from appearing on the LEDs. Datasbeet Note with the simplified schematic you dont need two latches, only one. I think you also missed my little ‘smiley’. We are giving information to a newbe.


Haven’t received registration validation E-mail? Whatever data is present on the inputs will be dwtasheet and latched in the outputs when the clock switches from 0 to 1 a rising edge.

And, your “simplified schematic” is incomplete since it does not make use of the 74HC output-control pin, [pin-1], detailed below. Forums Posts Latest Posts. For best explanation, datashest not start by reading the wikipedia article http: Then, insert the control pin bit before displaying the value.

Essentials Only Full Version. The 74HC has a tri-state output control pin, [pin1]. My favorate method is to use a seperate, very inexpensive 16FA to do nothing but input serial data, and output LCD data. 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 Each ‘1’ bit in the 74uc374 latch will light the LED in that column in the selected row.

The outputs then remain fixed until the next rising edge on the clock pin.