ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 27

• 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

2.3.5 Input Membership Function.
ST FIVE allows the management of triangular
Mbfs. In order to define an Mbf, three different
types of data must be stored on the Program/Data
Memory:
the vertex of the Mbf: V;
the length of the left semi-base: LVD;
the length of the right semi-base: RVD;
In order to reduce the size of the memory area
and the computational effort the vertical dimension
of the vertex is set to 15 (4 bits).
By using the previous memorization method differ-
ent kinds of triangular Membership Functions may
be stored. Figure 4.6 illustrates a typical example
of Mbfs that can be defined in ST FIVE.
Each Mbf is then defined storing 3 bytes in the first
1 Kbyte of the program memory.
The Mbf is memorized by using the following
instruction:
MBF n_mbf lvd v rvd
where
n_mbf identifies Mbf, lvd, v, and rvd, which are the
parameters that describe the Mbf’s shape.
Figure 2.10 Mbfs Parameters
1 5
1 5
w
0
0
X
V
L V D
In p u t M b f
O u tp u t S in g le to n
R V D
In p u t V a r ia b le
O u tp u t V a r ia b le
2.3.6 Output Singleton.
ST FIVE 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 identi-
fied by the couple (X, w), where the w is calcu-
lated by the Inference Unit as described before.
Often, a Singleton is simply identified with its Crisp
Value X.
2.3.7 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 opera-
tors (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.
Figure 2.11 Example of valid Mbfs
ST52T400/T440/E440/T441
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