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Complex and Internal Triggers
6.8.4
Filter Trace Example – Program Memory
A program has a large delay loop. How can program execution be traced without
wading though thousands of delay loop cycles?
For this, use a Filter Trace. Specify the traced addresses to be everything except the
program memory range where the delay loop is located. Uncheck Ignore FNOP Cycles.
Check Infinite Events and use either a software breakpoint or a user halt to stop emu-
lation or uncheck Infinite Events and enter a value for Captured Events. When viewing
the trace memory window, all instances of the delay code should be gone.
FIGURE 6-14:
FILTER TRACE
6.8.5
Filter Trace Example – Data Memory
How do I filter on data memory?
Filtering on PICmicro file register reads and writes will result in the collection of the
cycles immediately following the R/W. While this is not exactly the information you are
looking for, it does provide two data points:
1. The program memory after the R/W occurred, so you can track down places in
your code that affect a particular variable or SFR.
2. The number of times the R/W occurred, providing you with a count of the
collected cycles.
There are two ways to capture the actual data values with a filter. The first is to filter on
the routine that does the R/W. This will generate some extra cycles, but will collect the
proper information. The second is to make code that will generate two R/W cycles to
the same location, one of which does not affect the actual data. For instance, the
register can be ANDed with a value of 0xFF to generate the extra cycle like this:
test
movlw 0xFF
movwf LSDigit
test1
decfsz LSDigit
andwf LSDigit; generate extra read/w to LSDigit
goto test1
? 2004 Microchip Technology Inc.
DS51490A-page 47
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