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Hi,
I build USB clone but i have problem with self test Module Vpp.
This is MPLAB IDE output:
Connecting to MPLAB ICD 2
ICDWarn0059: About to re-program ICD2 USB Boot firmware code. Please do NOT disconnect the ICD2 or interrupt this operation!
...Connected
Setting Vdd source to MPLAB ICD 2
ICDWarn0020: Invalid target device id (expected=0x70, read=0x0)
...Reading ICD Product ID
Running ICD Self Test
... Failed Self Test. See ICD2 Settings (status tab) for details.
MPLAB ICD 2 Ready
I guess you would have to look at the diagram on page 24 of the datasheet, and experiment with the value of the FOSC3:FOSC0 bits in the config. word CONFIG1H, which is 111x for your setting at the moment. So just change 'x' and see if it works.
I guess you would have to look at the diagram on page 24 of the datasheet, and experiment with the value of the FOSC3:FOSC0 bits in the config. word CONFIG1H, which is 111x for your setting at the moment. So just change 'x' and see if it works.
Hi
My ICD 2 is almost finished, but i don't have 20MHz quartz at home. Must 16f877 run at 20MHz? I have only 24MHz quartzes.
Later:
I have placed the 24MHz crystal to the 4550, and changed the PLLDIV bits to Divide by 6, but when i connect it to the USB port, windows says: "USB Device Not Recognized. One of the USB devices attached to this computer has malfunctioned, and Windows does not recognize it."
I had 2 problems:
1. If i use 24MHz quartz, the device is not recognized by Windows.
2. Under Windows Server 2003 MPLAB doesn't install the USB drivers(it says, MPLAP currently doesn't support this OS). The solution is copying the Drivers folder(MPLAB IDE\ICD2\Drivers) from another computer that runs XP, and in the Data1.cab u will find a small utility called mpusbiru.exe, which will preinstall the driver. After this windows recognizes the device normally.
Finally works my icd2. I have tested it only for programming yet, and is very fast. I thought that, when the icd2 isn't in programming or debugging process, the PGD and PGC pins are in high impedance. But they aren't. It is a small letdown for me. I'm thinking on adding cmos switches to my design.
hi all, its my turn to face probs. tested my circuit on breadboard. but no lucks. first my pc was able to detect the icd, but later. NOTHING. can connect o anything tried many times of reinstalling the software. but stil can get it work. tried with serial ICD2 n got it working serially. reinterface with 4550, it can detect to icd2 but can get connection with 877A. tried reconnecting several times. now everything got screw up. Cant get ANY connection serially o USB. need help.
I also tried to build an "Ad-hoc" system with some wires soldered under my old Serial board - however it seems that this will make too much sources for errors and I didn't get it to work - so I decided to build a testboard.
If you have the chance to build PCB in your home lab - then take one of the layouts already posted here and build it.
If not, either take a "thru hole board" and solder the components on it - or sent me a PM and I will make a PCB for you when I am in my homelab again.
- Maximum frequency of F877A is 20Mhz.
- You can use MPLAB or Winpic800 to open icd24550_new_boot.hex, you will see config bit is PLL div 5, therefore 20Mhz XTAL is right.
I'm building one from your PCB file, but iI have a question on what components for D6 & D7. Are they Schottky Diodes? or what Diodes should I use? Thanks!
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