This is a working RS232.... ICD2 !!!!

[edalab]

ic2 lothar

Thank you much ,crazyduck.
I can update icd2 firmware for pic16f877a.

 

[alex_ts]

ftopic74753-60.html

hi edalab, what circuit did you use exactly?

 

[taylor2000]

mplab usingnewcomnums

Hi, CD & Zaphod42 & Edalab,
what's the confignation bit for 877A by using Zaphod42's boot loader.
My board can connect to MPLAB, after choose download operating system, some error message shows as below:

ICD0024: Failed to write to Com Port (<Unknown>) (MPLABCOM = 0x0) (USBCOM = 0x0) (0x461)
...Download Operating System Failed
ICD0024: Failed to write to Com Port (<Unknown>) (MPLABCOM = 0x0) (USBCOM = 0x0) (0x461)
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation

 

[simce]

74ls07 replacement

Does anyone know why MCP41xxx is needed? To be more precise why voltage correction is needed? As i can see from PIC programming specs all pic's are programed with Vpp at around 12,5-13,5V?

 

[Zedman]

connecting to debug executive

To be more precise why voltage correction is needed?

Yes, and it's automatically set by the firmware, depending on the chip to be programmed.

It can be replaced with a potmeter, but sometimes if programming fails,
you should check the needed voltage in MPLAB's settings and set it manually on it.

good luck,
Zed

 

[simce]

18f877a

I was not sure if this potentiometer is used always to adjust programming voltage regarding load on this pin. In my own version of ICD2 i'm not using this pot and i've adjusted Vpp at 13V. Untill now i had no problem programming various PIC's. I was just curious why it is needed.

 

[kdtxwx]

digital potentiometer rs232

i,m china
i dont know english
i,m makeing a icd2 use a pic16f877a,cannot link ok ,but error

Downloading Operating System
ICD0152: Failed to read all of requested bytes (0x0 of 0x8)
...Download Operating System Failed
ICD0152: Failed to read all of requested bytes (0x0 of 0x2)
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
MPLAB ICD 2 Ready

please help me

 

[crazyduck]

16f877a 18.432 oscillator

Hi,
Be sure you have the correct firmware for 16F877A.
Look on the forum.

CD

 

[taylor2000]

usingnewcomnums

CD,
Would you pls. send me one copy which is working with 877A well and explain me the configuration bit setting, My board is connected to MPLAB, but can not update firmware.

Pls. help
e-mail: zhang_taylor2000@yahoo.com

 

[kdtxwx]

icd2 montagem 16f877

i,m have not the correct firmware for 16F877A

i,m use not MCP41010 ,OK?

i,m use a BootLoader.hex and ORIGINAL FIRMWARE.hex not ok

My board is connected to MPLAB, but can not update firmware

please Give me a ok *.hex for pic16f877a

my email:kdtxwx@163.net

please help me !

 

[crazyduck]

icd0152:

Hi,
For the bootloader for 16f877A you find it on the previous page of this topic. You can replace the digital potentiometer with a trimmer, just ajust manually the vpp voltage at 13V.

For the firmware all you want to know it on this topic !!

CD

 

[kdtxwx]

icd2 ini

thank you ,
if vpp=13v ,MCP41010 can don,t use?
my BootLoader.hex file and my schdoc ok ,why?

i,ll Experiment;

 

[kdtxwx]

rs232 digital pot

now my vpp=12.7v ,hex file use the BootLoader.hex

but ide Hint:

Connecting to MPLAB ICD 2
...Connected
ICD0082: Failed MPLAB ICD 2 operation
MPLAB ICD 2 Ready
Downloading Operating System
ICD0152: Failed to read all of requested bytes (0x0 of 0x8)
...Download Operating System Failed
ICD0152: Failed to read all of requested bytes (0x0 of 0x2)
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
MPLAB ICD 2 Ready

my schdoc WHERE ERROR?
if error PLEASE edit

 

[Mozfet]

rs232 source code

Hi.

My PC is very slow (266 MHz only). Do you have the ICD2 PCB and
schematic in a file for Protel99 SE. I can't open the Protel 2004 file.

Thanks

 

[kdtxwx]

microchip icd2 hardware commands

hi,this is a icd2 pcb and sch for 99se
but i,m don,t ok

 

[crazyduck]

layer icd2 serie

Hi,
For the fuses for bootloader everythink must be disabled except WRT=enabled.

Oscillator must be HS.

CD

I'll try to look at your schematic

 

[movingbait]

icd0092 error

The charge pump can only supply a small current, therefore make the resistnace larger ~10k-30k, see which one is best

also i did a simulation for the 13V, VPP switching, something aint right....

I stopped there.

 

[Mozfet]

isd2+schematics

What do you mean, that you are not OK? Are the shematic and PCB tested and working ?
Can I trust the file?

Thanx

 

[davorin]

18f877a x pin

Any reason connecting Q2 BC557 upside down???? (o;

 

[axl]

pic icd rs232

I noticed that MAX232 charge-pump and its associated circuitry can't raise the voltage over 13V. Additionally this voltage is lowered by LM317 dropout and the pitiful regulation of the doubler when U5F output is in low state (sinking approx. 2.5mA from VPP)

I suggest using a higher supply voltage (around 16V) in order to connect it directly to LM317 input

Good Luck