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CS5464 датащи(PDF) 18 Page - Cirrus Logic |
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CS5464 датащи(HTML) 18 Page - Cirrus Logic |
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18 / 46 page ![]() CS5464 18 DS682F3 5.2.5 Serial Interface The CS5464 provides 5 pins, SCLK, SDI, SDO, CS, and MODE for communication between a host microcon- troller or serial E2PROM and the CS5464. MODE is an input that, when high, indicates to the CS5464 that a serial E2PROM is being used instead of a host microcontroller. It has a weak pull-down allowing it to be left unconnected if microcontroller mode is used. SCLK is used to shift and qualify serial data. Serial data changes as a result of the falling edge of SCLK and is valid during the rising edge. It is a Schmitt-trigger input for host microcontrollers, and a driven output for serial E2PROMs. SDI is the serial data input to the CS5464. SDO is the serial data output from the CS5464. It’s out- put drivers are disabled whenever CS is de-asserted, al- lowing other devices to drive the SDO line. CS is the chip select input for the serial bus. A high logic level de-asserts it, tri-stating the SDO pin and clearing the serial interface. A low logic level enables the serial port. This pin may be tied low for systems not requiring multiple SDO drivers. CS is a driven output when inter- facing to serial E2PROMs. |
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