PIC12F629/675 Limitations

Headers are required for debug when using the listed devices. See the “Processor Extension Pak and Debug Header Specification” for details. Header limitations are as follows:

  • General Debug Limitations
  • General Programming Limitations
  • General Device-ME2/ICE/ICD Limitations
  • You cannot single step through an interrupt. Due to hardware restrictions, the debugger/emulator cannot jump to the interrupt vector memory location in Single Step mode.
  • Cannot erase ID memory at Vdd < 4.5 V. At Vdd < 4.5 V, the part cannot be bulk erased, so it has to be row erased. Row erase can be used on program memory, but not on configuration memory (where user ID resides).
  • Program memory standard Flash. Program memory, not enhanced Flash. You cannot program in Low Voltage mode (Vdd < 4.5 V). See device programming specification for more information.
  • RBIF is cleared when PORT is interrogated by software, except when Freeze on Halt is enabled.
  • This header cannot be programmed while the GP1/RA1 pin is high (VIH) due to an –ICD debug silicon issue. There are two workarounds:
    (1) Move the circuitry that makes GP1/RA1 high to another I/O pin during programming.
    (2) Manually make GP1/RA1 low during programming (for debuggers/emulators that can supply power to the target):
    • Disconnect the header from the target circuit.
    • Select File > Project Properties, click the debugger, and select Power from the Option categories menu. Check the Power target circuit from… box if it is not already checked.
    • Connect GP1 to Vss on the header.
    • Select Debug > Discrete Debugger Operation > Build for Debugging.
    • Select Debug > Discrete Debugger Operation > Program Device for Debugging.
    • Disconnect GP1 from Vss on the header.
    • If you were NOT using a debug tool to power your target board, select File > Project Properties, click the debugger, and select Power from the Option categories menu. Uncheck the Power target circuit from… box if it is checked.
    • Insert the header into the target board.
    • Code is now programmed into the device and ready to be debugged. Select Debug > Discrete Debugger Operation > Launch Debugger.
    • Repeat the process to reprogram the device.

Freeze on Halt Limitations

  • Timer0 will not freeze using the internal clock.
  • CMOUTx pins do not freeze, status bits and interrupt flags do freeze.
  • RBIF is cleared when PORT is interrogated by software, except when Freeze on Halt is enabled.

For PIC12F675-ICD (AC162050) Only

  • GP1 should be pulled low for this header; otherwise, you might not be able to program and debug using the header.
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