PIC16F877 Family Limitations

PIC16F877, PIC16F876, PIC16F874, PIC16F873, PIC16F872

These device families do not require a header for debug and none is available. Device limitations are as follows:

  • General Debug Limitations
  • General Programming 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.
  • Program memory standard Flash. Program memory, not enhanced Flash. You cannot program in Low Voltage mode (Vdd < 4.5 V). See the device programming specification for more information.
  • BF is cleared when SSPBUF is interrogated by software, except when Freeze on Halt is enabled.
  • RCIF is cleared when RCREG is interrogated by software.
  • RBIF is cleared when PORT is interrogated by software.

Freeze on Halt Limitations

  • Timer0 will not freeze using the internal clock.
  • Timer0 will not freeze using the external clock.
  • PORTB values change in Watch window when refreshed after values on PORTB inputs have changed while halted.

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