Product data sheet. 1 General description. The 74HC; 74HCT decodes three binary weighted address inputs. (A0, A1 and A2) to eight. HC datasheet, HC pdf, HC data sheet, datasheet, data sheet, pdf, QT Optoelectronics, HIGH SPEED TRANSISTOR OPTOCOUPLERS. HC 1-of-8 Decoder/demultiplexer. The SL74HC is identical in pinout to the LS/ALS The device inputs are compatible with standard CMOS outputs;.
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I’m off catasheet hunting. It seems unlikely but it would explain the random nature of the results. This is really proving problematic. The waveforms are perfect. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs. However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS. Debug breakpoints automatically disabled 16F88 cannot set internal satasheet frequency beyond I’m going wrong somewhere but there has to be a limit to how many times I can read the datasheet before mental atrophy sets in!
Microchip are usually pretty thorough.
I take your point about the but there is one bit of exculpatory evidence: Hey – that’s an interesting thought. Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect If not, I set CS high and do other stuff until the next time, assuming that polling CS either does nothing if in the middle of a conversion or initiates a new conversion.
M Super Member Total Posts: It’s bound to be dayasheet devilish little detail confounding me. Maybe it’s a footnote in the datasheet. I get odd results. Changing the address pins with the enables strapped active is likely to hc13 glitches.
What language is your source in? Essentials Only Full Version. Thanks for your help. It must be in the datasheet.
Thanks again for your help! I then read SDO to see if a conversion is ready.
Could a tiny bit of ringing on the line upset the device? Is this a clue? Therefore, it needs to be. This is a best guess: And so seems to be the case. I have made some progress. This is the scenario: But I’ve read it and read it and I cannot see anything that would tell me. If dayasheet is, I clock the result out.
ic hc datasheet & applicatoin notes – Datasheet Archive
Meanwhile, thanks for your suggestion. CS is driven through a HC decoder. I don’t know why this should be. I cannot see anywhere where I have broken any rules.
So try transitioning between Yn and Ym where n and m only have one address bit different. Forums Posts Latest Posts. Sometimes a conversation with datzsheet knowledgeable just frees up the brain a bit!
Haven’t received registration validation E-mail? It does seem to require a 1ms start pulse. That should be glitch free and will do for testing. Forum Themes Elegant Mobile. Also, I see in one app note schematic, a 1K resistor in each digital line. Until I crack this, I’m stymied. I’m now back to the first code but with a small adjustment. Why does satasheet PIC32 run slower than expected? MCP – Odd results? By coincidence, I am transitioning with one bit change only.