| 00:38.36 | *** join/#edev surfbuddy (n=VA44227@e179240103.adsl.alicedsl.de) |
| 00:39.35 | surfbuddy | prpplague, so.. sorry..couldnot thank you before. |
| 00:40.39 | surfbuddy | it was univs closing time. |
| 00:44.48 | surfbuddy | prpplague, well..we were talking about.. Xin and Xout.. why would thre necessarily be both Xin and Xout..on the micorproc chip? |
| 01:17.37 | MonMotha | surfbuddy: you'd only need one input for a clock, but oscillators are built using feedback |
| 01:17.56 | MonMotha | the Xin/Xout provides access to the feedback network so that you can just hang a crystal off of it and have it oscillate |
| 01:18.20 | MonMotha | Often times you can just hook a TTL level clock up to one or the other (check the datasheet for which one) if you prefer |
| 01:19.30 | MonMotha | the normal network for a crystal clock oscillator these days is a CMOS logic inverter with the output fed back to the input through the crystal, using the crystal as a very sharp filter |
| 01:29.11 | surfbuddy | MonMotha, could not quite follow you |
| 01:30.23 | surfbuddy | if there is an ocsillator on the board, which of the pin Xin or Xout generates the signals |
| 01:32.33 | MonMotha | what happense is that there's a little noise on the output/input of the inverter. This is then passed from the output of the inverter through the crystal which filters it to a very specific frequency and passes it to the input. The inverter inverts it and it passes around again. Quickly, you'll end up with oscillations at the frequency of the oscillator (or an overtone, if things don't quite work out) |
| 01:34.21 | surfbuddy | MonMotha, hmm |
| 01:35.52 | MonMotha | basically, you're using the inverter as a semi-linear amplifier (people usually put a resistor across it to somewhat linearize it) with 180 degrees of phase shift |
| 01:36.33 | surfbuddy | i dont think the pins are of much use to programming though |
| 01:36.42 | MonMotha | they generally cannot be programmed |
| 01:36.52 | MonMotha | they are usually dedicated to hooking up a crystal or system clock |
| 01:37.53 | surfbuddy | MonMotha, thanks..quite informative |
| 02:05.13 | surfbuddy | MonMotha, this is what is driving me crazy.. |
| 02:05.25 | surfbuddy | – Enhanced Clock Generator and Power Management Controller |
| 02:05.25 | surfbuddy | – Two On-chip Oscillators with Two PLLs |
| 02:05.25 | surfbuddy | – Very Slow Clock Operating Mode and Software Power Optimization Capabilities |
| 02:05.25 | surfbuddy | – Four Programmable External Clock Signals |
| 02:05.25 | surfbuddy | – System Timer Including Periodic Interrupt, Watchdog and Second Counter |
| 02:05.26 | surfbuddy | – Real-time Clock with Alarm Interrupt |
| 02:05.28 | surfbuddy | – Debug Unit, Two-wire UART and Support |
| 02:07.47 | MonMotha | and? |
| 02:14.26 | surfbuddy | MonMotha, u see..therz 4 external clock signals |
| 02:15.00 | surfbuddy | and how are these clock signals generated ? |
| 02:15.23 | surfbuddy | certainly not by the main oscillator ? |
| 02:31.16 | MonMotha | generally from one of the PLLs |
| 02:31.23 | MonMotha | usually with an optional further divider |
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| 14:34.04 | chouimat | morning |
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| 19:46.30 | wmat | heh |
| 19:47.01 | wmat | this is good: http://www.codon.org.uk/~mjg59/bruce/ |
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