ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 25

• 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

2.3 Fuzzy Computation
ST FIVE’s Fuzzy main features are:
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 2.7 Fuzzy Inference
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.
FUZZYFICATION
Input Values
11
nm
1m
n1
INFERENCE
PHASE
Figure 2.6 Alpha Weight Calculation
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
ij
1
1
N rules -1
N rules
2
ST52T400/T440/E440/T441
DEFUZZYFICATION
j-th Mbf
Input Value
Output Values
i-th INPUT VARIABLE
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