ST52F510 datasheet(58/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

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Figure 8.5 Example of valid Mbfs

8.6 Output Singleton

The Decision Processor uses a particular kind of

membership function called Singleton for its output

variables. A Singleton doesn’t have a shape, like a

traditional Mbf, and is characterized by a single

point identified by the couple (X, w), where w is

calculated by the Inference Unit as described

earlier. Often, a Singleton is simply identified with

its Crisp Value X.

Figure 8.6 Output Membership Functions

8.7 Fuzzy Rules

Rules can have the following structures:

if A op B op C...........then Z

if (A op B) op (C op D op E...) ...........then Z

where

op is one of the possible linguistic operators

(AND/OR)

In the first case the rule operators are managed

sequentially; in the second one, the priority of the

operator is fixed by the brackets.

Each rule is codified by using an instruction set, the

inference time for a rule with 4 antecedents and 1

consequent is about 3 microseconds at 20 MHz.

The Assembler Instruction Set used to manage the

Fuzzy operations is reported in the table below.

i-th OUTPUT

j-th Singleton

Table 8.1 Fuzzy Instructions Set

Instruction

Description

MBF

n_mbf Ivd v rvd

Stores the Mbf

n_mbf with the shape identified by the parameters Ivd, v and rvd

n m

Fixes the alpha value of the input n with the Mbf m

ISNOT

n m

Calculates the complementary alpha value of the input n with the Mbf m.

FZAND

Implements the Fuzzy operation AND

FZOR

Implements the Fuzzy operation OR

CON

crisp

Multiplies the crisp value with the last

ω weight

OUT

n_out

Performs Defuzzyfication and stores the currently Fuzzy output in the register

n_out

FUZZY

Starts the computation of a sigle fuzzy variable

( )

Modify the priority in the rule evaluation

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