Datasheet

PICkit™ 3 Debug Express Lessons

Step into the following statement and through the function, which erases a 64-byte

block of memory that the strings are stored in.

// Erase the 64 bytes starting at 0x100

ProgMemErase64(0x100);

After completing the erase, select menu Debugger > Read. In the Program Memory

window, the 64 bytes of program memory starting at address 0x0100 where the strings

were stored have been erased, as shown in Figure 3-56.

FIGURE 3-56: ERASED 0X0100 TO 0X013F

The remaining code creates a 32-byte buffer in RAM and fills it with the alphabet

characters in uppercase, plus a few punctuation characters at the end. This buffer is

then written to the 32-byte block of program memory starting at 0x0100 that was just

erased. Since we read program memory, we’ll have to reset the debugger. Select

Debugger > Reset > Processor Reset

. Right-click on the source code and select

Breakpoints > Remove All Breakpoints

from the pop-up menu to clear the breakpoint

we set earlier. Run the program. After running for a few seconds, select Debugger >

Halt. The program should be stopped at final while(1) loop. Select Debugger > Read

again and we can see that the write to program memory was successful.

FIGURE 3-57: PROGRAM MEMORY WRITE RESULTS