ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 8

• 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
1.2 Operational Description
ST52x400/440/441 ICU can work in two modes:
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
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.
8/94
Memory Programming Phase
Working Phase
to
RESET status; then 12V are
Table 1.1
Control
RESET
Signal
Vpp
Control Signals Setting
gramming
5V /12V
Pro-
0
Reset
0
0
Working
1
0