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SRI512 датащи(PDF) 20 Page - STMicroelectronics |
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SRI512 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 47 page ![]() Memory mapping SRI512 20/47 4.4.2 Fixed Chip_ID (option) The SRI512 is provided with an anticollision feature based on a random 8-bit Chip_ID. Prior to selecting an SRI512, an anticollision sequence has to be run to search for the Chip_ID of the SRI512. This is a very flexible feature, however the searching loop requires time to run. For some applications, much time could be saved by knowing the value of the SRI512 Chip_ID beforehand, so that the SRI512 can be identified and selected directly without having to run an anticollision sequence. This is why the SRI512 was designed with an optional mask setting used to program a fixed 8-bit Chip_ID to bits b7 to b0 of the system area. When the fixed Chip_ID option is used, the random Chip_ID function is disabled. |
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