ST52T400G2B6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST52T400G2B6

8-BIT INTELLIGENT CONTROLLER UNIT (ICU) Timer/PWM, Analog Comparator, Triac/PWM Timer, WDG

STMicroelectronics 

ST52T400/T440/E440/T441

2.3 Fuzzy Computation

ST FIVE’s Fuzzy main features are:

s Up to 8 Inputs with 8-bit resolution;

s 1 Kbyte of Program/Data Memory available to

store more than 300 to Membership Functions

(Mbfs) for each Input;

s Up to 128 Outputs with 8-bit resolution;

s Possibility to process fuzzy rules with an

UNLIMITED number of antecedents

s 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.

Figure 2.6 Alpha Weight Calculation

1

αij

j-th Mbf

i-th INPUT VARIABLE

Input Value

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 2.7 Fuzzy Inference

11

1m

FUZZYFICATION

n1

nm

INFERENCE

PHASE

1

2

N rules -1

N rules

DEFUZZYFICATION

Input Values

Output Values

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