On 10/3/06, WH Tan <whsiung.my@gmail.com> wrote:
>
> Think of the header as 2 part.  Part A: the extra pins that designed
> for ICD2 communication and setting up some options (like jumper, some
> other type of headers don't have jumper).  This part also include the
> ~ICDMCLR, which has taken some reposibility (Vpp) off the usual
> MCLR/Vpp pins as you will find in usual ICD capable device, like the
> high pin count PIC.
>
> PART B: The 8 pins that are mapped to emulate the actual F675.  For
> this part to work, you have only one option regarding the
> configuration of the MCLR.  It must be configured as MCLR. Not a true
> MCLR as some of its responsibility (Vpp) has been taken by PART A
> (~ICDMCLR),    BUT it must still be pull-up to Vdd, as you did with a
> normal PIC's MCLR.  Without that the PIC won't run, and the ICD2
> communication can't be established. Can you just find a 10k resistor
> and connect it to the header to perform the test.  It sould be joint
> to pin 3 and pin 6 of the -ICD.  You can find the PCB trace and join
> it at the top side of the PCB.  Or connect the 10k resistor at your
> target and plug the header in.
>

I do not think it is a good idea to put the 10k resistor at the top
side of the PCB. It should be in the target board.

I've used the ICD2 with 12F629 (using the same header as 12F675,
use the jumper setting to disable the ADC inside 12F675). I can
say it is a pain to use. There are many limitations to take note.
It is still usefull but limited.

>From MPLAB V7.42 ICD2 Help:
PIC12F629/675, PIC16F630/676, PIC16F627A/628A/648A Limitations
PIC12F675-ICD - PIC12F629/675

Debugger Limitations:
Device-ICD/ICE Limitations
You cannot single step through an interrupt.
Devices cannot be programmed or read while GP1/RA1 is high (Vih). Move
circuitry that makes GP1/RA1 high to another I/O pin during
development.
Programming these devices while debugging may be slower as these
devices do not have row erase capability.
Programmer Limitations
Program Memory standard flash

Device-ICD/ICE Limitations
For some devices, only the ICD/ICE version of the device (e.g.,
PIC12F629-ICD) can be used to debug with MPLAB ICD 2.
ICD/ICE devices must be used with a header board. See the Header Board
Specification (DS51292).
Only ICD/ICE devices can be programmed using the MPLAB ICD 2 Header.
Use the Universal Programming Module (AC162049) to program regular
devices.
ICD/ICE devices must be clocked (internally on INTOSC or externally on
OSC1) and have MCLR high to communicate with the MPLAB ICD 2.
A breakpoint cannot be set on a GPIO instruction. Since MPLAB ICD 2
I/O is through bits 6 and 7 of GPIO, setting a breakpoint on a GPIO
instruction will cause communication problems.

Programmer Limitations
Care should be taken when programming the PLL.
For all devices with EEPROM memory, Erase operations will also erase
EEPROM memory.
If your code makes use of port pins that correspond to Clock and Data
pins in programming mode, you may not be able to reprogram your
device. See Warning 0033 for more information.

Regards,
Xiaofan
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