Timeline for Need help understanding Ultra Low Power Wakeup on PIC16F887
Current License: CC BY-SA 3.0
20 events
| when toggle format | what | by | license | comment | |
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| Mar 19, 2013 at 18:20 | answer | added | jwygralak67 | timeline score: 0 | |
| Jan 26, 2013 at 21:05 | comment | added | Michael | @justing I am using a scope to read the signal on the pin. I have taken to not using a cap, and simply switching the pin from low to high. | |
| Jan 26, 2013 at 20:29 | comment | added | justing | @Michael Just to get more clarifications out of the way: What exactly is your test setup? Do you have a multimeter connected to the pin the whole time? This will be injecting a current and keep the pin charged. Have you tried the ULPWU with nothing on the pin except for the capacitor (No test equipment)? | |
| Jan 26, 2013 at 10:59 | comment | added | apalopohapa | @Michael Actually, a strong external drive to ground would trigger the ULPWU comparator regardless of whether PORTA is an input or an output. Test how strong is the HIGH in PORTA by placing a resistor to ground and measuring its voltage. | |
| Jan 26, 2013 at 8:24 | history | edited | Michael | CC BY-SA 3.0 |
added 1090 characters in body
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| Jan 18, 2013 at 22:19 | history | edited | Michael | CC BY-SA 3.0 |
added 200 characters in body
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| Jan 17, 2013 at 3:58 | answer | added | justing | timeline score: 2 | |
| S Jan 17, 2013 at 3:33 | history | suggested | Chetan Bhargava | CC BY-SA 3.0 |
fixed grammar and spellings
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| Jan 17, 2013 at 2:01 | review | Suggested edits | |||
| S Jan 17, 2013 at 3:33 | |||||
| Jan 17, 2013 at 1:56 | comment | added | Michael | @gmagno That cant be right. When the pin is manually connected to ground, the processor wakes and an interrupt is generated. That would indicate the ULWU feature is working and the PORTA is set for input. | |
| Jan 17, 2013 at 0:36 | comment | added | gmagno | You probably are clearing, instead of setting the least significant bit of TRISA. It should be "BSF TRISA, 0" instead of "BCF TRISA, 0" | |
| Jan 14, 2013 at 6:46 | comment | added | apalopohapa | You've posted the sample code, but it may help if you post the actual code you are using. There might be something wrong there. | |
| Jan 14, 2013 at 4:23 | comment | added | Michael | @Oli Glaser I have tried 100uF, 10uF, and somewhere in the pF range. | |
| Jan 14, 2013 at 1:04 | comment | added | Oli Glaser | What value capacitor do you have the pin attached to? | |
| Jan 14, 2013 at 1:03 | history | tweeted | twitter.com/#!/StackElectronix/status/290625094370349056 | ||
| S Jan 13, 2013 at 22:14 | history | suggested | Chris Laplante | CC BY-SA 3.0 |
remove salutations, add PDF warning, add reference figures/code
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| Jan 13, 2013 at 22:05 | review | Suggested edits | |||
| S Jan 13, 2013 at 22:14 | |||||
| S Jan 13, 2013 at 22:02 | history | suggested | Chris Laplante | CC BY-SA 3.0 |
remove salutations, add PDF warning
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| Jan 13, 2013 at 21:59 | review | Suggested edits | |||
| S Jan 13, 2013 at 22:02 | |||||
| Jan 13, 2013 at 21:54 | history | asked | Michael | CC BY-SA 3.0 |