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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CD4014 PDF Datasheet浏览和下载

CDBE with buttons and leds Q8. Clock falling doesn’t do a thing, as you would expect. CD – truth table. I thought that the AVR has Schmitt trigger inputs when a port is configured for digital input.

What does Qn-1 do? PE – LOW 6.

CD Datasheet(PDF) – Fairchild Semiconductor

Mechanical switches should never drive logic clocks directly for this reason! MarkT Brattain Member Posts: CDBE with buttons and leds. Under these conditions, the chip does not advance these 8 bits at all and SER IN is completely ignored.


Here’s how I use the switches to duplicate what the MCU does: Data Sheet for the CD Is this not happening? The first one was wrong, the 8 input switches should be connected to VDD, not ground.

CD – Q8 output. Q7 goes into Q8. I’ve found some code online but unfortunately it is not helpful for understanding how the shift register works.

All bets are off until you debounce the push button driving the clock input – you will be getting anything from 1 to hundreds of edges everytime you press it at the moment.

Input s n – LOW 5. I did this before with a 74HC shift register and it clarified for me how it dwtasheet, but with the CD it’s a different story.

CD (BE) – Understanding the truth table

While doing the tests I wrote down the output state of Q8. What does Q1 Internal mean? CD BE – Understanding the truth table. Here is it in English.

I’ve just updated the schematic image. Basically I’m duplicating what a MCU does but at very slow speed. Have you hit all pins with a logic probe to make sure they have the voltage you think they do? JoeN on Oct 09, JoeN Edison Member Posts: I’m not sure if this is the correct way to do it but I got some results that I don’t understand. I will never ask you to do anything that I wouldn’t do myself.


In either case, after the clock rises, Q6, Q7, and Q8 are available on their respective output pins. That is what the data sheet says, at least. MarkT on Oct 06, I read the truth table simply. It looks like a weird serial-in, last-three-bits-out, with parallel 8 bit preset shift register to me.

This is called a “preset” function. According to the output table image CD – Q8 output. Input s n – HIGH I did this with one of the 8 inputs and in another test with two inputs simultaneously 3.