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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92F124 датащи(PDF) 325 Page - STMicroelectronics |
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ST92F124 датащи(HTML) 325 Page - STMicroelectronics |
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325 / 426 page  325/426 CONTROLLER AREA NETWORK (bxCAN) CONTROLLER AREA NETWORK (Cont’d) CAN 2.0B Active Core The bxCAN module handles the transmission and the reception of CAN messages fully autonomous- ly. Standard identifiers (11-bit) and extended iden- tifiers (29-bit) are fully supported by hardware. Control, Status and Configuration Registers The application uses these registers to: – Configure CAN parameters, e.g.baud rate – Request transmissions – Handle receptions – Manage interrupts – Get diagnostic information Tx Mailboxes Three transmit mailboxes are provided to the soft- ware for setting up messages. The transmission Scheduler decides which mailbox has to be trans- mitted first. Acceptance Filters The bxCAN provides eight scalable/configurable identifier filter banks for selecting the incoming messages the software needs and discarding the others. Receive FIFO Two receive FIFOs are used by hardware to store the incoming messages. Three complete messag- es can be stored in each FIFO. The FIFOs are managed completely by hardware. Figure 143. CAN Block Diagram Mailbox 2 Mailbox 1 7 6 5 CAN 2.0B Active Core Mailbox 0 Transmission Acceptance Filters Tx Mailboxes Master Control Scheduler Master Status Transmit Control Transmit Status Transmit Priority Receive FIFO Error Status Error Int. Enable Tx Error Counter Rx Error Counter Diagnostic Bit Timing Filter Mode Filter Config. Page Select Interrupt Enable Mailbox 0 1 2 Receive FIFO 1 4 3 2 1 Filter 0 Mailbox 0 1 2 Receive FIFO 0 9 |
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