| ??? 05/06/05 18:17 Read: times |
#93121 - nope Responding to: ???'s previous message |
i think it is due to more drive capability of pic pins as compared to 8052.
More drive capability should equal more noise. Coming to think of it your test is meaningless. The noise generated by a uC is very much dependent on what it drives, so, for a realistic test, you should include "typical" loads on the driven pins. Just visualize a port pin driving a LED, the return current run across the PCB ground from the LED to the uC. That will generate waaaay more noise than a uC "running empty" Erik |
| Topic | Author | Date |
| noise comparison | 01/01/70 00:00 | |
| apples and oranges | 01/01/70 00:00 | |
| decoupling | 01/01/70 00:00 | |
| possibly | 01/01/70 00:00 | |
| directly soldered | 01/01/70 00:00 | |
| 10nF | 01/01/70 00:00 | |
| and get ceramic | 01/01/70 00:00 | |
| FFT | 01/01/70 00:00 | |
| no analog part | 01/01/70 00:00 | |
| when extreme DIP is a no-no | 01/01/70 00:00 | |
| thats right | 01/01/70 00:00 | |
| long internal wires | 01/01/70 00:00 | |
| what why less in pic | 01/01/70 00:00 | |
| Identical ? | 01/01/70 00:00 | |
| any reason you like | 01/01/70 00:00 | |
| thats valuable | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| but if | 01/01/70 00:00 | |
| regardless of how you do it | 01/01/70 00:00 | |
| have any body got zero level | 01/01/70 00:00 | |
| Philosophically .... | 01/01/70 00:00 | |
| how to post jpg | 01/01/70 00:00 | |
| Posting Images. | 01/01/70 00:00 | |
| how to post | 01/01/70 00:00 | |
| "Print" formats ? | 01/01/70 00:00 | |
| screen grab | 01/01/70 00:00 | |
| What you see isn't just 'ground noise'! | 01/01/70 00:00 | |
| here is layout steve | 01/01/70 00:00 | |
| What is it???? Too few details>>>> | 01/01/70 00:00 | |
| sufficient | 01/01/70 00:00 | |
| Re: Suffiecient. | 01/01/70 00:00 | |
| Are the Xtal burden caps really.... | 01/01/70 00:00 | |
| let me explain | 01/01/70 00:00 | |
| never coils in power return | 01/01/70 00:00 | |
| but they are | 01/01/70 00:00 | |
| yes | 01/01/70 00:00 | |
| ApplesandOranges, | 01/01/70 00:00 | |
| ok steve | 01/01/70 00:00 | |
| Read and inwardly digest | 01/01/70 00:00 | |
ok i will don with diff. | 01/01/70 00:00 | |
| also | 01/01/70 00:00 |