User manual

EEP and Emulation Header User’s Guide

DS50002243A-page 28  2014 Microchip Technology Inc.

3.2.3 Header Limitations

See the “Limitations” section in your debug tool online Help file for details.

Additionally, the following silicon errata applies to this header:

Hardware Breakpoint Issue

When using this emulation header with C language or Assembly language code,

hardware breakpoints will not function past memory locations 0x3FF for the following

emulated devices:

• PIC16F1936, PIC16LF1936

• PIC16F1937, PIC16LF1937

Workarounds:

1. Software breakpoints for these four parts could be used (with the caveat that

software breakpoints do not offer the advanced capability of hardware

breakpoints).

2. Any function(s) that need to be debugged with hardware breakpoints could be

explicitly (and temporarily) located in the program memory area below 0x400

until the function is properly debugged.

In C language for the MPLAB XC8 C compiler, this can be done with the @

address construct as follows, which will locate function_1 at program

memory base address 0x200.

void function_1(void) @ 0x200

{

asm("NOP");

}

In assembly language for the MPASM assembler, this can be done with the CODE

directive as follows, which will locate function_1 at program memory base

address 0x200.

HW_BRKPT CODE 0x0200

function_1:

NOP

RETURN