Code was working with TV display then TV stopped. I tried several flasher programs and noticed two with same code (one worked the other not). The only difference was one had a CON block that set system clock at 80Mhz the other no CON block. Then I tried different clock settings and found that only when set to
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
did it not work. Internal oscillator and even other PLL settings did.
I switched back and forth between 2 Quickstart boards to confirm. One will not work at 80Mhz but still works at others.
I was trying to power both the Quickstart board (through a voltage regulator) and a anemometer needing >12 volts (and outputting 0-5 volts) through a wall wart.
Code was working with TV display then TV stopped. I tried several flasher programs and noticed two with same code (one worked the other not). The only difference was one had a CON block that set system clock at 80Mhz the other no CON block. Then I tried different clock settings and found that only when set to
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
did it not work. Internal oscillator and even other PLL settings did.
I switched back and forth between 2 Quickstart boards to confirm. One will not work at 80Mhz but still works at others.
I was trying to power both the Quickstart board (through a voltage regulator) and a anemometer needing >12 volts (and outputting 0-5 volts) through a wall wart.
Certainly sounds like the output for the 16x clock signal packed it in. Still usable for a lot of things, but I would not use it in a hard to access location or a customer's equipment.
Code was working with TV display then TV stopped. I tried several flasher programs and noticed two with same code (one worked the other not). The only difference was one had a CON block that set system clock at 80Mhz the other no CON block. Then I tried different clock settings and found that only when set to
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
did it not work. Internal oscillator and even other PLL settings did.
I switched back and forth between 2 Quickstart boards to confirm. One will not work at 80Mhz but still works at others.
I was trying to power both the Quickstart board (through a voltage regulator) and a anemometer needing >12 volts (and outputting 0-5 volts) through a wall wart.
Certainly sounds like the output for the 16x clock signal packed it in. Still usable for a lot of things, but I would not use it in a hard to access location or a customer's equipment.
Are you sure the xtal is 5MHz and not 10MHz which requires pllx8 ?
Code was working with TV display then TV stopped. I tried several flasher programs and noticed two with same code (one worked the other not). The only difference was one had a CON block that set system clock at 80Mhz the other no CON block. Then I tried different clock settings and found that only when set to
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
did it not work. Internal oscillator and even other PLL settings did.
I switched back and forth between 2 Quickstart boards to confirm. One will not work at 80Mhz but still works at others.
I was trying to power both the Quickstart board (through a voltage regulator) and a anemometer needing >12 volts (and outputting 0-5 volts) through a wall wart.
Certainly sounds like the output for the 16x clock signal packed it in. Still usable for a lot of things, but I would not use it in a hard to access location or a customer's equipment.
Are you sure the xtal is 5MHz and not 10MHz which requires pllx8 ?
The Xtal on the Quickstart is a SMD soldered 5 Megger. Not sure if he took the time to change it.
I think you need the PLL to get NTSC out. I don't think I've seen a prop fail in such a way that the PLL would work at 40 MHz but not 80 MHz.
I suppose it's possible though.
Sadly, I've seen a few where the PLL just didn't work at all after putting 5V on an I/O pin...
Yep, 5MHz and not worth changing. When the Radio Shack's were closing out I bought about a dozen Quickstart boards for under $10 each. Have given some away to students but still have 5 or 6. Some dedicated to projects and
Comments
I switched back and forth between 2 Quickstart boards to confirm. One will not work at 80Mhz but still works at others.
I was trying to power both the Quickstart board (through a voltage regulator) and a anemometer needing >12 volts (and outputting 0-5 volts) through a wall wart.
Certainly sounds like the output for the 16x clock signal packed it in. Still usable for a lot of things, but I would not use it in a hard to access location or a customer's equipment.
https://www.parallax.com/product/p8x32a-q44
Using ChipQuik:
https://www.amazon.com/ChipQuik-SMD1-Leaded-Temperature-Removal/dp/B0019UZP7I/ref=sr_1_1?ie=UTF8&qid=1523540523&sr=8-1&keywords=chipquik
And some Solder Wick:
https://www.amazon.com/Vastar-Solder-Packs-Desoldering-Length/dp/B073TRWY19/ref=sr_1_1_sspa?ie=UTF8&qid=1523540643&sr=8-1-spons&keywords=wick+solder&psc=1
Takes about a half hour to replace the Prop without fancy SMD desoldering stations.
Are you sure the xtal is 5MHz and not 10MHz which requires pllx8 ?
The Xtal on the Quickstart is a SMD soldered 5 Megger. Not sure if he took the time to change it.
I suppose it's possible though.
Sadly, I've seen a few where the PLL just didn't work at all after putting 5V on an I/O pin...