My Precision Clock was behaving in strange ways and the In Circuit Debugger looks like a good way to see what's going on. The older ICD will work on the 16F870 that I started using for this clock, but Microchip is introducing a new ICD2 that will have much more capability but does not support the 16F870. It does however support the 16F873A which is a drop in replacement with much more memory and that helps the ICD. So the plan is to use the 16F873A for debug and development and switch back to the 16F870 for production.
Microchip ICD2 web site -18 Nov 2002 - ICD2 now working. Needed to download MPLAB 6.10.00, follow the USB instructions, update the ICD firmware.
Burning Firmware methods
- Classical remove chip and program in a programmer like the Picstart Plus (my current method)
- In Circuit Serial Programming - uses the same pins and protocol as the programmer but is done in circuit. There are some hardware requirements to get this to work and many app notes.
- Low Voltage In Circuit Serial Programming - this is supported on some of the newer chips and is similar to the older ICSP except that only logic levels are needed. On those chips that support a boot loader it's possible to use a serial interface (with hardware CTS/RTS hand shaking) to allow the chip to load it's software without a programmer. This is great for field upgrades to the firmware. The "A" suffix PICs have improved boot load features.
- In order to use the boot loader feature the chip must be programmed using one of the other methods first to get the boot loader software into the chip.
- ICD programming is similar to the ICSP except it may have fewer restrictions in terms of the target hardware. LV ICSP is disabled when the ICD is programming since the ICD2 uses the classical higher voltage programming method.
When using the ICD it's necessary to have a project with compiled code then you must program the target PIC. You can not use a PIC with just the target program installed. This is becasue additional code is loaded into the PIC to support the debug process. When using View ->file Registers you can type in the first letter of the variable or file you want which is way way easier than trying to use the scroll bar.
There appears to be a bug in the skip over command, it jumped over two instructions rather than just one.
My target clock uses RB6 and RB7 as digit driver lines going to the gates of some hexfets. When the debugger code is installed into the PIC these lines no longer work for display and so far I have not determined how to load just the desired application code.
21 Dec 2002 - There are seperate top tabs for selecting your programmer and debugger. If the debugger is set to "none" and the ICD2 is set as the development programmer then you could load the target chip with just the application code and not the additinal debug code. MPLAB will you to have the ICD2 used for either Debugging (where it loads the extra code) or Probramming (where it does not add the debugger code), but not both. If you try to enable both MPLAB will direct to to close the other one.
21 Dec 2002 - Using ICD2 as a programmer for the 12F675 requires removing the LEDs that I have connected directly to GP0 and GP1.
The Microchip web site says that when any erase operation is done on the 12F765 ALL the memory is erased. This is not acceptable for my application where I need the data EEPROM to remain intact when the program code is burned in.
19 Nov 2002 - MPLAB ICD 2 Firmware Version 1.03.00, November 6, 2002 supports the following chips:
PIC16F630*(2) PIC16F676*(2)PIC16F818* PIC16F819* PIC16F870* PIC16F871* PIC16F872* PIC16F873* PIC16F873A* PIC16F874* PIC16F874A* PIC16F876* PIC16F876A* PIC16F877* PIC16F877A*
PIC18C601 PIC18C801 PIC18F1220* PIC18F1320* PIC18F2220* PIC18F2320* PIC18F242 PIC18F248 PIC18F252 PIC18F258 PIC18F4220* PIC18F4320* PIC18F442 PIC18F448 PIC18F452 PIC18F458 PIC18F6620* PIC18F6720* PIC18F8620* PIC18F8720*
* Indicates new part support in this release. For information on full support vs. beta support, see the MPLAB IDE Device Selection dialog.
(1) - AC152050 required. or see Hardware below for modular connector
(2) - AC162052 required. or see Hardware below for modular connector
The DV164006 Kit that I got came with the PICDEM2+ but did not include the AC162049 Universal Programming module that is an interface with the 6P6C socket and a socket to allow this adapter to be placed between a DIP packaged PIC and it's socket. The related AC162050 for the 18F629/675 and the AC162051 Header interface are also NOT included.
6 Position 6 Contact (6P6C) phone socket on target board. The 6P6C is wider than a standard telephone RJ-11 2C4P modular connector and narrower than a CAT5 LAN 8P8C connector.
6-pin modular socket, it is an AMP/TYCO Electronics part # 520470-4 (Digikey part # A9049-ND)
The Jameco p/n 124038 comes with wire leads that can be soldered into via holes on an existing board making conversion to ICD easier.
The Jameco p/n 115836 is very similar to the AMP socket
* these two pins are reversed in DS41190A for the 12F629 & 12F675
6P6C pin # PIC pin 8 pin PIC Jameco 124038
1 MCLR/Vpp GP3/MCLR White 2 Vdd Vdd Black 3 Ground Gnd Red 4 RB7/PG Data GP0* Green 5 RB6/PG Clock GP1* Yellow 6 not used not used Bllue
MCLR10 k Ohm pull up on MCLR so that the ICD can force 0, +5, +13 volts on this pin.
RB6 and RB7 used for serial clock and data between target and ICD2 module
Address 0000, a NOP was recommended for the first ICD, but the factory says that it's not needed with ICD2, I have it there anyway.
5.70.40 - does not support ICD2 with 16F873A
6.00.20 - needed for ICD2 and 16F873A
- needed for USB instead of complex serial interface between computer and ICD2
6.10.00 - Available Dec 2002
Microchip is not talking about what the on chip circuitry does.
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