HCS12 datasheet(347/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

347

Line 21 is the beginning of defuzzification. The WAV instruction calculates

a sum-of-products and a sum-of-weights.

Line 22 completes defuzzification. The EDIV instruction performs a 32-bit by

16-bit divide on the intermediate results from WAV to get the weighted

average.

Line 23 moves the EDIV result into the double accumulator.

Line 24 stores the low 8-bits of the defuzzification result.

This example inference program shows how easy it is to incorporate fuzzy

logic into general applications using the CPU12. Code space and execution

time are no longer serious factors in the decision to use fuzzy logic. The next

section begins a much more detailed look at the fuzzy logic instructions of

the CPU12.

9.4 MEM Instruction Details

This section provides a more detailed explanation of the membership

function evaluation instruction (MEM), including details about abnormal

special cases for improperly defined membership functions.

9.4.1 Membership Function Definitions

Figure 9-4 shows how a normal membership function is specified in the

CPU12. Typically, a software tool is used to input membership functions

graphically, and the tool generates data structures for the target processor

and software kernel. Alternatively, points and slopes for the membership

functions can be determined and stored in memory with define-constant

assembler directives.

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