st52t430 STMicroelectronics, st52t430 Datasheet - Page 43

• Manufacturer Part Number: st52t430
• Description: 8-bit Intelligent Controller Unit Icu Three Timer/pwms, Adc, Sci
• Manufacturer: STMicroelectronics

Figure 7.5 Example of valid Mbfs
7.6 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.
Table 7.1 Fuzzy Instructions Set
MBF n_mbf Ivd v rvd Stores the Mbf n_mbf with the shape identified by the parameters Ivd , v and rvd
LDP n m
LDN n m
FZAND
FZOR
LDK
SKM
LDM
CON crisp
OUT n_out
FUZZY
Instruction
Fixes the alpha value of the input n with the Mbf m and stores it in internal registers
Calculates the complementary alpha value of the input n with the Mbf m . and stores the result
in internal registers
Implements the Fuzzy operation AND between the last two values stored in internal registers
Implements the Fuzzy operation OR between the last two values stored in internal registers
Stores the result of the last Fuzzy operation executed in internal registers
Loads the result of the last performed Fuzzy operation (stored in the temporary register K) in
the temporary buffer M.
Copies the value of register M in the data stack
Multiplies the crisp value with the last
Performs Defuzzyfication and stores the currently Fuzzy output in the RAM n_out location
Starts the Fuzzy algorithm
Figure 7.6 Output Membership Functions
7.7 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.
1
0
weight
ij
i0
in
Description
X
i0
j-th Singleton
X
ij
X
in
i-th OUTPUT
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