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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny167-ESSZ датащи(PDF) 163 Page - ATMEL Corporation |
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ATtiny167-ESSZ датащи(HTML) 163 Page - ATMEL Corporation |
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163 / 282 page  163 7728D–AVR–07/09 ATtiny87/ATtiny167 15.3 LIN Protocol 15.3.1 Master and Slave A LIN cluster consists of one master task and several slave tasks. A master node contains the master task as well as a slave task. All other nodes contain a slave task only. Figure 15-1. LIN cluster with one master node and “n” slave nodes The master task decides when and which frame shall be transferred on the bus. The slave tasks provide the data transported by each frame. Both the master task and the slave task are parts of the Frame handler 15.3.2 Frames A frame consists of a header (provided by the master task) and a response (provided by a slave task). The header consists of a BREAK and SYNC pattern followed by a PROTECTED IDENTIFIER. The identifier uniquely defines the purpose of the frame. The slave task appointed for provid- ing the response associated with the identifier transmits it. The response consists of a DATA field and a CHECKSUM field. Figure 15-2. Master and slave tasks behavior in LIN frame The slave tasks waiting for the data associated with the identifier receives the response and uses the data transported after verifying the checksum. Figure 15-3. Structure of a LIN frame master task slave task master node slave task slave node 1 slave task slave node n LIN bus Master Task Slave Task 1 Slave Task 2 HEADER RESPONSE HEADER RESPONSE BREAK Field SYNC Field CHECKSUM Field DATA-0 Field Field IDENTIFIER PROTECTED DATA-n Field Break Delimiter Response Space Inter-Byte Space Inter-Frame Space RESPONSE HEADER FRAME SLOT Each byte field is transmitted as a serial byte, LSB first. |
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