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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I’m not sure if this is the correct way to do it but I got some results that I don’t understand. Data Sheet for the CD What does Q1 Internal mean? What does Qn-1 do? Q7 goes into Q8. PE – LOW 6. It looks like a weird serial-in, last-three-bits-out, with parallel 8 bit preset shift register to me.

I’ve just updated the schematic image.

I did this before with a 74HC shift register and it clarified for me how it functions, but with the CD it’s a different story. Have you hit all pins with a logic probe to make sure they have the voltage you think they do? This is called a “preset” function.



I read the truth table simply. I will never ask you to do anything that I wouldn’t do myself. While doing the tests I wrote down the output state of Q8. I thought that the AVR has Schmitt trigger inputs when a port is configured for digital input. That is what the data sheet says, at least. Under these conditions, the chip does not advance these 8 bits at all and SER IN is completely ignored.

Mechanical switches should never drive logic clocks directly for this reason! Clock falling doesn’t do a thing, as you would expect.

CD4014 PDF Datasheet浏览和下载

CDBE with buttons and leds. MarkT Brattain Member Posts: Input s n – HIGH I did this with one of the 8 inputs and in another test with two inputs simultaneously 3.

Input s n – LOW 5. The first one was wrong, the 8 input switches should be connected to VDD, not ground. CD BE – Understanding the truth table. In either case, after the clock rises, Q6, Q7, and Q8 are available on their respective output pins. Is this not happening?


CD datasheet, CD datasheets, manuals for CD electornic semiconductor part

CDBE with buttons and leds Q8. According to the output table image CD – Q8 output. MarkT on Oct 06, JoeN Edison Member Posts: Basically I’m duplicating what a MCU does but at very slow speed.

JoeN on Oct 09, Here’s how I use the switches to duplicate what the MCU does: I’ve found some code online but unfortunately it is not helpful for understanding how the shift register works. CD – Q8 output. 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.

CD – truth table. Here is it in English.