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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MarkT Brattain Member Posts: Is this not happening?

Have you hit all pins with a logic probe to make sure they have the voltage you think they do? Clock falling doesn’t do a thing, as you would expect. Under these conditions, the chip does not advance these 8 datasheeh at all and SER IN is completely ignored. That is what the data sheet says, at least. I’ve found some code online but unfortunately it is not helpful for understanding how the shift register works.


According to the output table image CD – Q8 output. 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. CD BE – Understanding the truth table. CDBE with buttons and leds Q8. CD – Q8 output.

The first one was wrong, the 8 input switches should be connected to VDD, not ground. Here’s how I use the switches to duplicate what the MCU does: What does Q1 Internal mean?


JoeN on Oct 09, In either case, after the clock rises, Q6, Q7, and Q8 are available on their respective output pins. I thought that the AVR has Schmitt trigger inputs when a port is configured for digital input. I’m not sure if this is the correct way to do it but I got some results that I don’t understand. This is called a “preset” function.

Here is it in English. While doing the tests I wrote down the output state of Q8. PE – LOW 6. Data Sheet for the CD Q7 goes into Q8.


CD (NSC) PDF技术资料下载 CD 供应信息 IC Datasheet 数据表 (6/6 页)

Input s n – HIGH I did this with one of the 8 inputs and in another test with two inputs simultaneously 3. It looks like a weird serial-in, last-three-bits-out, with parallel 8 bit preset shift register to datasheeh. I’ve just updated the schematic image. MarkT on Oct 06, Mechanical switches should never drive logic clocks directly for this reason!

I will never ask you to do anything that I wouldn’t do myself. Input s n – LOW 5. I read the truth table simply.

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. CDBE with buttons and leds. What does Qn-1 do? Basically I’m duplicating what a MCU does but at very slow speed. CD – truth table. JoeN Edison Member Posts: