The CDBM CDBC is an 8-stage parallel input se- rial output shift register A parallel serial control input en- ables individual JAM inputs to each of 8 . Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . CD The an 8-stage parallel input serial output shift register A parallel serial control input enables individual JAM inputs to each of 8 stages Q outputs are.

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Have you hit all pins with a logic probe to make sure they have the voltage you think they do? All bets are off until you debounce the push button datasyeet the clock input – you will be getting anything from 1 to hundreds of edges everytime you press it at the moment. Here’s how I use the switches to duplicate what the MCU does: CDBE with buttons and leds.

PE – LOW 6. MarkT on Oct 06, CDBE with buttons and leds Q8. In either case, after the clock rises, Ddatasheet, Q7, and Q8 are available on their respective output pins. That is what the data sheet says, at least.


I read the truth table simply.

Shift Register CD , How to program to get suffecient DAC ?

This is called a “preset” function. I’m not sure if this is the correct way to do it but I got some results that I don’t understand.

I thought that the AVR has Schmitt trigger inputs when a port is configured for digital input. MarkT Brattain Member Posts: Under these conditions, the chip does not advance these 8 bits at all and SER IN is completely ignored. It looks like a weird serial-in, last-three-bits-out, with parallel 8 bit preset shift register to me.

CD Datasheet(PDF) – National Semiconductor (TI)

I will never ask you to do anything that I wouldn’t do myself. I’ve found some code online but unfortunately it is not helpful for understanding how the shift register works. Input s n – HIGH I did this with one of the 8 inputs and in another test with two inputs simultaneously 3.

Is this not happening? I’ve datwsheet updated the schematic image.


(PDF) CD4014 Datasheet download

According to the output table image CD – Q8 output. CD – truth table.

CD – Q8 output. Clock falling doesn’t do a thing, as you would expect. Basically I’m duplicating what a MCU does but at very slow speed. Q7 goes into Q8. While doing the tests I wrote down the output state of Q8.

CD4014 PDF Datasheet浏览和下载

The first one was wrong, the 8 input switches should be connected to VDD, not ground. JoeN Edison Member Posts: Here is it in English. Mechanical switches should never drive logic clocks directly for this reason!

JoeN on Oct 09, CD BE – Understanding the truth table. Data Sheet for the CD I did this before with a 74HC shift datassheet and it clarified for me how it functions, but with the CD it’s a different story.

Input s n – LOW 5. What does Qn-1 do? What does Q1 Internal mean?