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X9409WS24 Datasheet(PDF) 8 Page - Xicor Inc. |
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X9409WS24 Datasheet(HTML) 8 Page - Xicor Inc. |
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8 / 21 page  X9409 – Preliminary Information Characteristics subject to change without notice. 8 of 21 REV 1.6 1/30/03 www.xicor.com DETAILED OPERATION All XDCP potentiometers share the serial interface and share a common architecture. Each potentiometer has a Wiper Counter Register and 4 Data Registers. A detailed discussion of the register organization and array operation follows. Wiper Counter Register The X9409 contains four Wiper Counter Registers, one for each XDCP potentiometer. The Wiper Counter Register can be envisioned as a 6-bit parallel and serial load counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written directly by the host via the Write Wiper Counter Register instruction (serial load); it may be written indirectly by transferring the contents of one of the four associated Data Registers via the XFR Data Register instruction (parallel load); it can be modified one step at a time by the Increment/ Decrement instruction. Finally, it is loaded with the contents of its Data Register zero (DR0) upon power-up. The WCR is a volatile register; that is, its contents are lost when the X9409 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, it should be noted this may be different from the value present at power-down. Data Registers Each potentiometer has four nonvolatile Data Registers. These can be read or written directly by the host and data can be transferred between any of the four Data Registers and the Wiper Counter Register. It should be noted all operations changing data in one of these registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer, these registers can be used as regular memory locations that could possibly store system parameters or user preference data. Register Descriptions Data Registers, (6-Bit), Nonvolatile: Four 6-bit Data Registers for each XDCP. (sixteen 6-bit registers in total). – {D5~D0}: These bits are for general purpose not vol- atile data storage or for storage of up to four different wiper values. The contents of Data Register 0 are automatically moved to the wiper counter register on power-up. Wiper Counter Register, (6-Bit), Volatile: One 6-bit Wiper Counter Register for each XDCP. (Four 6-bit registers in total.) – {D5~D0}: These bits specify the wiper position of the respective XDCP. The Wiper Counter Register is loaded on power-up by the value in Data Register R0. The contents of the WCR can be loaded from any of the other Data Register or directly by command. The contents of the WCR can be saved in a DR. D5 D4 D3 D2 D1 D0 NV NV NV NV NV NV (MSB) (LSB) WP5 WP4 WP3 WP2 WP1 WP0 VVVVVV (MSB) (LSB) |
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