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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 200 Page - STMicroelectronics |
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RM0319 датащи(HTML) 200 Page - STMicroelectronics |
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200 / 368 page  Controller area network ports (CAN) RM0319 200/368 Doc ID 022640 Rev 3 feedback from its Tx output to its Rx input. The actual value of the CAN_RX input pin is disregarded by the CAN core. The transmitted messages can be monitored at the CAN_TX pin. 15.4.7 Using the loop back mode combined with silent mode It is also possible to combine loop back mode and silent mode by programming LBack and Silent bits to one at the same time. This mode can be used for a “Hot Selftest”, which means that the CAN can be tested without affecting a running CAN system connected to the pins CAN_TX and CAN_RX. In this mode, the CAN _RX pin is disconnected from the CAN core and the CAN_TX pin is held rescessive. The following figure shows the connection of signals CAN_TX and CAN_RX to the CAN core in case of the combination of loop back mode with silent mode. Figure 70. CAN core in loop back combined with silent mode 15.4.8 Managing message objects Figure 71. Message identifier formats Tx Rx CAN Core C_CAN CAN_TX CAN_RX =1 Bus idle DLC Arbitration field Control field Bus idle 11-bit Identifier Arbitration field Control field 18-bit Identifier 11-bit Identifier DLC Standard format: 11-bit message identifier Extended format: 29-bit message identifier |
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