Picstart plus and pic18f2331

[Bruce]

I can't help with the PICStart+ programming for an 18F2331, but I do see a few potential problems.

#byte port_b=0x81 should be #byte port_b=0xF81.

Also you should have HS VS XT as your #fuses option for a 20MHz crystal. XT provides a lower drive
level, which may not be providing enough drive signal for your 20MHz crystal.

For help with CCS C code, config options, etc.. check here http://www.ccsinfo.com/forum/

[jhasan]

Henrik,

I have connected a 1k resistor between pin 7 and pin 11.Also, connected pin 7 to pin 20 (AVDD AND VDD pins) and pin 8 to pin 19 (AVSS and VSS pins).Then when I do a blank check I get:
"
Device is NOT blank:
Program Memory
Configuration Bits
IDs
Data Memory
"

Then when I do a read I get:

"
Device is data protected! Data memory may be invalid.

Device is code protected! Program memory may be invalid.
"

I looked at the thread you asked me to take a look at and they show how to do ICSP.I have done that but still I have not solved the problem.

Did you use MPLAB IDE version 8.10 and picstart firmware version 04.50.09?

It seems that for some reason I cannot erase my pic18f2331???????

Please let me know.

Thanks

[mackrackit]

This is from when I asked MicrChip about a similar problem .

Customer Update 3/10/2007 8:01

I think I fixed the problem. Placed the 18F4320 in a breadbord and jumped from MCLR, RB6, RB7, and VSS. Powered the chip with an external power supply with a 4.7uf across VDD and VSS.

Working 100% of the time now.


Customer Update 3/9/2007 13:37

9 out 14 chips are programming approx 75% of the time with a 4.7uf. It is getting better.

Thank you for your help.

Support Response 3/9/2007 12:03

To program the 18f4320 on the PS+ may require the placement of a 0.1uF bypass capacitor from the VDD pin to the VSS pin of the device to successfully program the device. If programming failures still arise, try increasing this value incrementally to a maximum of 10uF. A low ESR capacitor such as a tantalum is recommended.

[HenrikOlsson]

It's been a year or two since I actually used the PICStart+ (other hobbies to has gotten my attention lately) so I don't remember what firmware it has or what version of MPLAB I used. But I know that I wrote about the whole thing in the previously linked thread, everything I had to do is in there. If it still doesn't work for you I don't think I can help, sorry.