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YSS901 Datenblatt(PDF) 7 Page - List of Unclassifed Manufacturers |
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YSS901 Datenblatt(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 14 page YSS901 7 g Serial Microcomputer Interface Format for writing data through microcomputer After setting the address (A0 and A1) through SI, it is possible to write data (D0 to D7) into the specified address when R/W bit has been set to “0”. The address map is as shown below. Address Data Description A1, A0 0 0 D0 CSEL0 D1 CSEL1 D2 CSEL2 D3 BSFT0 D4 BSFT1 D5 to D7 To be “0”. 0 1 D0 Write address selection D1 Write address counter clear D2 RAM clear D3 to D7 To be “0”. 1 0 D7 to D0 Coefficient data to be written (higher byte) 1 1 D7 to D0 Coefficient data to be written (lower byte) How to write coefficient data into RAM Two coefficients are used as a set, each constituted with 16 bits x 125 taps. The first coefficient (“coef1” shown in the block diagram) is written into RAM address 0-124, and the second one (“coef2” shown in the block diagram) into RAM address 125-249. The address counter for writing the data uses seven (7) bits, the upper bit (8th bit) uses “write address selection” of D2 with A1, A0 = 0 1. Data writing procedure (1) Clear the RAM and write address counter. (RAM clear needs up to 2 fs to be completed.) (2) When the RAM has been cleared, write data into higher byte and then into lower byte starting at the first byte of the first coefficient. (When the writing into the lower byte has been completed, the data is actually written into RAM. Wait 1 fs before writing the data into higher byte of the next coefficient.) (3) When the first coefficient has been written, write the second one by using the same procedure. Set the “write address selection” bit to “1” when writing data into the 4th tap and after of the second coefficient. |
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