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ST52T440F2M6 bảng dữ liệu(PDF) 8 Page - STMicroelectronics |
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8 / 94 page ST52T400/T440/E440/T441 8/94 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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