ST52T400 datasheet(25/94 Pages) STMICROELECTRONICS

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ST52T400/T440/E440/T441

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2.3 Fuzzy Computation

ST FIVE’s Fuzzy main features are:

Up to 8 Inputs with 8-bit resolution;

1 Kbyte of Program/Data Memory available to

store more than 300 to Membership Functions

(Mbfs) for each Input;

Up to 128 Outputs with 8-bit resolution;

Possibility to process fuzzy rules with an

UNLIMITED number of antecedents

UNLIMITED number of Rules and Fuzzy Blocks.

The limits on the number of Fuzzy Rules and

fuzzy Blocks are only related to the program mem-

ory size.

2.3.1 Fuzzy Inference .

The block diagram illustrated in Figure 2.7

describes the different steps performed during a

fuzzy algorithm. The ST FIVE Core allows the

implementation of a MAMDANI type fuzzy infer-

ence with crisp consequents. Inputs for fuzzy

inference are stored in 8 dedicated Fuzzy input

registers. The instruction LDFR is used to set the

input fuzzy registers with values stored in the Reg-

ister File. The result of a fuzzy inference is stored

directly in a location of the Register File.

2.3.2 Fuzzyfication Phase.

In this phase the intersection (alpha weight)

between the input values and the related Mbfs is

performed (Figure 2.6).

8 Fuzzy input registers are available for fuzzy

inferences.

After loading the input values by using the LDFR

assembler instruction, the user can start fuzzyn-

ference by using the assembler instructionFUZZY.

During fuzzyfication: input data is transformed in

the activation level (alpha weight) of the Mbfs. i

Figure 2.6 Alpha Weight Calculation

Input Value

αij

j-th Mbf

i-th INPUT VARIABLE

Figure 2.7 Fuzzy Inference

FUZZYFICATION

INFERENCE

PHASE

DEFUZZYFICATION

Nrules

N rules -1

Input Values

Output Values

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