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UM0934 датащи(PDF) 89 Page - STMicroelectronics |
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UM0934 датащи(HTML) 89 Page - STMicroelectronics |
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89 / 113 page ![]() UM0934 Management information base (MIB) Doc ID 17389 Rev 2 89/113 6.5.34 00C2h (time-slot delay bit) This object stores the delay between the external mains zero-crossing signal and the internal reference, used to set the starting position of the time-slot. The time unit is the bit. This object is useful for the Client operating mode only, as the Server fixes the internal time- slot reference after receiving a frame transmission by the Client. The value n stored is equal to n-1 delay bit number: an n value equal to 1 means that the Client aligns its time-slot with the external zero-crossing event. A value equal to 2 means that the Client forces its time-slot to start 1 bit before the external zero-crossing event. Any change to this value takes effect only after a de-synchronization of the Client. Figure 21 shows some examples of the relation between the external zero-crossing signal and internal reference for some values of n: Figure 21. Time-slot delay bit The confirm message of a CMD_ReadDBRequest returns the current constant without changing it. The CMD_WriteDBRequest sets the corresponding time value and the confirm message returns it. Read/write confirm data format: The same as request. Table 145. MIB object 00C2h: Write request data format Byte Label Description Available range Factory default 0..2 Time-slot delay bit b0..19: bit-time delay 000000h .. 0FFFFFh 1 b20..23: unused --- |
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