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ST52T400F1M6 Fiches technique(PDF) 8 Page - STMicroelectronics

No de pièce ST52T400F1M6
Description  8-BIT INTELLIGENT CONTROLLER UNIT ICU Timer/PWM, Analog Comparator, Triac/PWM Timer, WDG
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST52T400F1M6 Fiches technique(HTML) 8 Page - STMicroelectronics

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1.2 Operational Description
ST52x400/440/441 ICU can work in two modes:
s
Memory Programming Phase
s
Working Phase
according to RESET and Vpp signals levels (see
pins description) .
Note: When RESET=0 it is advisable not to use
the sequence “101010“ to port PA ( 7 : 2 ).
1.2.1 Memory Programming Phase.
The ST52x400/440/441 memory is loaded in the
Memory Programming Phase. All fuzzy and stan-
dard instructions are written inside the memory.
This phase starts by setting the control signals as
illustrated in (see Table 1.1).
When this phase starts, the ST52x400/440/441
core is set
to
RESET status; then 12V are
applied to the Vpp pin in order to start EPROM
programming. A signal applied to PB1 is used to
increment the memory address; the data is sup-
plied to PORT A (see EPROM programming for
further details).
1.2.2 Working Mode.
The processor starts the working phase following
the instructions, which have been previously
loaded in the memory.
ST52x400/440/441’s internal structure includes a
computational block, CONTROL UNIT (CU)/DATA
PROCESSING UNIT (DPU), which allows pro-
cessing of boolean functions and fuzzy algo-
rithms.
The CU/DPU can manage up to 334 different
Membership Functions for the fuzzy rules ante-
cedent part. The rule consequents are “crisp” val-
ues (real numbers). The maximum number of
rules that can be defined is limited by the dimen-
sions of the implemented standard algorithm.
EPROM is then shared between fuzzy and stan-
dard algorithms. The Membership Function data is
stored inside the first 1024 memory locations. The
Fuzzy rules are parts of the program instructions.
The Control Unit (CU) reads the information and
the status deriving from the peripherals.
Arithmetic calculus can be performed on these
values by using the internal CU and the 128/256
bytes of RAM, which supports all computations.
The peripheral input can be fuzzy and/or arith-
metic output, or the values contained in Data RAM
and EPROM locations.
Table 1.1
Control Signals Setting
Control
Signal
Pro-
gramming
Reset
Working
RESET
0
0
1
Vpp
5V /12V
0
0


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