Hi.
I can't really say I know anything about this,
but might it be that the "3.3V" is the problem ?
Does your device support a full erase at the level ?
It seems from the (rather old) data sheet that I have
that the device needs between 4.5 and 5.5 V to make
an "external timed erase", params D132, D132A and D132B.

Best Regards,
/Jan-Erik.



>  -----Original Message-----
> From: 	piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
> Sent:	den 29 december 2004 23:40
> To:	piclist@mit.edu
> Subject:	[PIC] Help needed - Cannot program Boot Sector in PIC18XX
> 
> I have a problem programming the Boot sector of PIC18LF6720.
> 
> Setup is MPLAB 7, ICD2 - R13, HI-TECH C, Windows 2000 Professional
> 
> The ICD is attached via USB cable and powered from Target (3.3V)
> 
> The problem occurred after I programmed a bootloader into the micro with 
the
> Code Protect Boot Enabled.
> 
> The bootloader ran OK but when I went to re-program the IC using the ICD, 
I
> cannot write anything between
> 0x000 and 0x0200.
> 
> If I erase the IC and read back and look at program memory all locations
> above 200h are set to ffffh but all locations
> from 0x00 to 0x200 are 00h.
> 
> I have disabled all protect bits in config settings but cannot get access 
to
> the boot area any more.
> 
> This has occurred on 2 target devices but if I program a target that has 
not
> had bootloader put into it
> the unit programs fine.
> 
> Programming Target...
> ...Erasing Part
> ...Programming Program Memory (0x0 - 0x2DF)
> Verifying...
> ...Program Memory
> ICD0161: Verify failed (MemType = Program, Address = 0x0, Expected Val 
=
> 0xEF0E, Val Read = 0x0)
> ICD0275:  Programming failed.
> MPLAB ICD 2 Ready
> 
> When I read back the memory. 0x00 to 0x200 are set to 0x00 but valid code
> exists from 0x200 to 0x2df
> 
> If I then switch over to Debugger, I get the following report (I did not
> enable the Code Protect Boot, it was disabled)
> 
> Connecting to MPLAB ICD 2
> ...Connected
> Setting Vdd source to target
> Target Device PIC18F6720 found, revision = a4
> ...Reading ICD Product ID
> Running ICD Self Test
> ...Passed
> MPLAB ICD 2 Ready
> Programming Target...
> ICDWarn0042:  Protect bit (CPB : Code Protect Boot) is enabled.  MPLAB 
ICD 2
> will not enter debug mode in this configuration.  Do you wish to disable
> this setting?
> ...Erasing Part
> ...Programming EEPROM Memory
> ...Programming Program Memory (0x0 - 0x2DF)
> ...Loading DebugExecutive
> ...Programming DebugExecutive
> ...Programming Debug Vector
> ...Programming RSBUG
> Verifying...
> ...Program Memory
> ...EEPROM
> ...Debug Executive
> ICD0161: Verify failed (MemType = Program, Address = 0x1FDD4, Expected 
Val =
> 0xD015, Val Read = 0x15)
> ICD0275:  Programming failed.
> MPLAB ICD 2 Ready
> 
> Thanks in advance for any help.
> 
> 
> 
> 
> Kind Regards
> 
> David Huisman (CEO)
> -----------------------------------------------------------------------
> ORBIT COMMUNICATIONS Pty Ltd - Wireless Solutions that Work
> (Telemetry, Control, Monitoring, Security, HVAC ...)
> A.C.N. 107 441 869
> 
> 
> Website : http://www.orbitcoms.com
> PO Box 4474 Lakehaven
> NSW 2263, AUSTRALIA
> Phone: 61-2-4393-3627
> Fax  : 61-2-4393-3685
> Mobile: 61-413-715-986
> 
> 
> 
> 
> 
>  << File: ATT225163.txt >> 



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist