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STR720 bảng dữ liệu(PDF) 234 Page - STMicroelectronics |
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STR720 bảng dữ liệu(HTML) 234 Page - STMicroelectronics |
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234 / 401 page ![]() STR720 - CONTROLLER AREA NETWORK (CAN) 234/401 New Data Registers 1 & 2 (CAN_NDnR) Address Offset: 120h (CAN_ND1R), 124h (CAN_ND2R) Reset Value: 0000 0000h These registers hold the NewDat bits of the 32 Message Objects. By reading out the NewDat bits, the CPU can check for which Message Object the data portion was updated. The NewDat bit of a specific Message Object can be set/reset by the CPU through the IFn Message Interface Registers or by the Message Handler after reception of a Data Frame or after a successful transmission. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 NewDat[32:17] r 15 14 13 12 11 10 98 765 432 10 NewDat[16:1] r Bits 31:16 NewDat32-17 New Data Bits (of all Message Objects) 0: No new data has been written into the data portion of this Message Object by the Message Handler since the last time this flag was cleared by the application software. 1: The Message Handler or the application software has written new data into the data portion of this Message Object. Bits 15:0 NewDat16-1 New Data Bits (of all Message Objects) 0: No new data has been written into the data portion of this Message Object by the Message Handler since the last time this flag was cleared by the application software. 1: The Message Handler or the application software has written new data into the data portion of this Message Object. 1 |
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