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AD6654/PCB 数据表(PDF) 86 Page - Analog Devices |
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AD6654/PCB 数据表(HTML) 86 Page - Analog Devices |
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86 / 88 page  AD6654 Rev. 0 | Page 86 of 88 • In the Intel mode microport, the beginning of a read and write access is indicated by the RDY pin going low. The access is complete only when the RDY pin goes high. In the Motorola mode microport, the completion of a read and write access is indicated by the DTACK pin going low. In both modes, CS, RD (DS), and WR (R/W) should be active until access is complete; otherwise, an incomplete access results. • In both Intel and Motorola modes, if CS is held low even after microport read or write access is complete, the microport initiates a second access. This is a problem while writing or reading from coefficient RAM, where each access writes to or reads from a different RAM address. This can be fixed by writing to one coefficient RAM address at a time, that is, the coefficient start and stop address registers have the same value. • In SPI mode programming, the SCS pin must go high (inactive) after writing or reading each byte (eight clock cycles on the SCLK pin). |
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