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L9805 Datenblatt(PDF) 72 Page - STMicroelectronics |
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L9805 Datenblatt(HTML) 72 Page - STMicroelectronics |
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72 / 103 page ![]() 72/103 L9805 CONTROLLER AREA NETWORK (Cont’d) FILTER HIGH REGISTERS (FHRx) Read/Write Reset Value: Undefined FIL[11:3] are the most significant 8 bits of a 12-bit message filter. The acceptance filter is compared bit by bit with the identifier and the RTR bit of the incoming message. If there is a match for the set of bits specified by the acceptance mask then the message is stored in a receive buffer. FILTER LOW REGISTERS (FLRx) Read/Write Reset Value: Undefined FIL[3:0] are the least significant 4 bits of a 12-bit message filter. MASK HIGH REGISTERS (MHRx) Read/Write Reset Value: Undefined MSK[11:3] are the most significant 8 bits of a 12- bit message mask. The acceptance mask defines which bits of the acceptance filter should match the identifier and the RTR bit of the incoming mes- sage. MSKi = 0: don’t care. MSKi = 1: match required. MASK LOW REGISTERS (MLRx) Read/Write Reset Value: Undefined MSK[3:0] are the least significant 4 bits of a 12-bit message mask. 70 FIL11 FIL10 FIL9 FIL8 FIL7 FIL6 FIL5 FlL4 70 FIL3 FIL2 FIL1 FIL0 0000 70 MSK11 MSK10 MSK9 MSK8 MSK7 MSK6 MSK5 MSK4 70 MSK3 MSK2 MSK1 MSK0 0 0 0 0 |
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