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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72311R датащи(PDF) 114 Page - STMicroelectronics |
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ST72311R датащи(HTML) 114 Page - STMicroelectronics |
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114 / 164 page  ST72311R, ST72511R, ST72512R, ST72532R 114/164 CONTROLLER AREA NETWORK (Cont’d) BAUD RATE PRESCALER REGISTER (BRPR) Read/Write in Standby mode Reset Value: 00h RJW[1:0] determine the maximum number of time quanta by which a bit period may be shortened or lengthened to achieve resynchronization. tRJW =tCAN * (RJW + 1) BRP[5:0] determine the CAN system clock cycle time or time quanta which is used to build up the in- dividual bit timing. tCAN =tCPU * (BRP + 1) Where tCPU = time period of the CPU clock. The resulting baud rate can be computed by the for- mula: Note: Writing to this register is allowed only in Standby mode to prevent any accidental CAN pro- tocol violation through programming errors. BIT TIMING REGISTER (BTR) Read/Write in Standby mode Reset Value: 23h BS2[2:0] determine the length of Bit Segment 2. tBS2 =tCAN * (BS2 + 1) BS1[3:0] determine the length of Bit Segment 1. tBS1 =tCAN * (BS1 + 1) Note: Writing to this register is allowed only in Standby mode to prevent any accidental CAN pro- tocol violation through programming errors. PAGE SELECTION REGISTER (PSR) Read/Write Reset Value: 00h PAGE[2:0] determine which buffer or filter page is mapped at addresses 0010h to 001Fh. 70 RJW1 RJW0 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0 BR 1 t CP U BRP 1 + () × BS1 BS23 ++ () × --------------------------------------------------------------------------------------------- - = 70 0 BS22 BS21 BS20 BS13 BS12 BS11 BS10 70 0 0 000 PAGE 2 PAGE 1 PAGE 0 PAGE2 PAGE1 PAGE0 Page Title 0 0 0 Diagnosis 0 0 1 Buffer 1 0 1 0 Buffer 2 0 1 1 Buffer 3 1 0 0 Filters 1 0 1 Reserved 1 1 0 Reserved 1 1 1 Reserved |
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