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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92F120 датащи(PDF) 238 Page - STMicroelectronics |
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ST92F120 датащи(HTML) 238 Page - STMicroelectronics |
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238 / 324 page  238/324 J1850 Byte Level Protocol Decoder (JBLPD) 10.8 J1850 Byte Level Protocol Decoder (JBLPD) 10.8.1 Introduction The JBLPD is used to exchange data between the ST9 microcontroller and an external J1850 trans- ceiver I.C. The JBLPD transmits a string of variable pulse width (VPW) symbols to the transceiver. It also re- ceives VPW encoded symbols from the transceiv- er, decodes them and places the data in a register. In-frame responses of type 0, 1, 2 and 3 are sup- ported and the appropriate normalization bit is generated automatically. The JBLPD filters out any incoming messages which it does not care to receive. It also includes a programmable external loop delay. The JBLPD uses two signals to communicate with the transceiver: – VPWI (input) – VPWO (output) 10.8.2 Main Features s SAE J1850 compatible s Digital filter s In-Frame Responses of type 0, 1, 2, 3 supported with automatic normalization bit s Programmable External Loop Delay s Diagnostic 4x time mode s Diagnostic Local Loopback mode s Wide range of MCU internal frequencies allowed s Low power consumption mode (JBLPD suspended) s Very low power consumption mode (JBLPD disabled) s Don’t care message filter s Selectable VPWI input polarity s Selectable Normalization Bit symbol form s 6 maskable interrupts s DMA transmission and reception with End Of Block interrupts 9 |
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