ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 26

• Manufacturer Part Number: ST52T440F3M6
• Description: MCU 8-Bit ST52 CISC 8KB EPROM 5V 20-Pin SO
• Manufacturer: STMicroelectronics

Specifications of ST52T440F3M6

• Package: 20SO
• Family Name: ST52
• Maximum Speed: 20 MHz
• Ram Size: 256 Byte
• Program Memory Size: 8 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 13
• On-chip Adc: 6-chx12-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 1

ST52T400/T440/E440/T441
2.3.3 Inference Phase.
The Inference Phase manages the alpha weights
obtained during the fuzzyfication phase to com-
pute the truth value ( ) for each rule.
This is a calculation of the maximum (for the OR
operator) and/or minimum (for the AND operator)
performed on alpha values according to the logical
connectives of fuzzy rules.
Several conditions may be linked together by lin-
guistic connectives AND/OR, NOT operator and
brackets.
The truth value
move to the Defuzzyfication phase in order to
complete the inference calculation.
Figure 2.8 Fuzzyfication
26/94
IF INPUT 1 IS X1 OR INPUT 2 IS X2 THEN .......
IF INPUT 1 IS X1 AND INPUT 2 IS X2 THEN ......
1
1
X1
X1
and the related output singleton-
Input 1
Input 1
OR = Max
X2
X2
Input 2
Input 2
Figure 2.9 Output Membership Functions
2.3.4 Defuzzyfication.
In this phase the output crisp values are deter-
mined by implementing the consequent part of the
rules.
Each consequent Singleton X
weight values
ence Unit, in order to compute the upper part of
the defuzzification.
Each output value is deduced from the conse-
quent crisp values (X
ing defuzzification formula:
where:
i = 0,1 identifies the current output variable
N = number of the active rules on the current out-
put
Xij = abscissa of the j-th singleton
Fuzzy outputs are stored in the RAM location i-th
specified in the assembler instruction OUT i.
ij
1
0
ij
i0
in
=weight of the j-th singleton
X
i0
i
, calculated by the Fuzzy Infer-
j-th Singleton
Y
i
=
X
i
ij
) by carrying out the follow-
∑
--------------------- -
N
j
∑
N
j
X
ij
ij
i
ij
is multiplied by its
X
in
i-th OUTPUT