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X9410WS24I Datasheet(PDF) 4 Page - Intersil Corporation |
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X9410WS24I Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 21 page 4 FN8193.2 October 12, 2006 Wiper Counter Register (WCR) The X9410 contains two Wiper Counter Registers, one for each XDCP potentiometer. The WCR is equivalent to a serial-in, parallel-out register/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 four associated Data Registers via the XFR Data Register or Global XFR Data Register instructions (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 Wiper Counter Register is a volatile register; that is, its contents are lost when the X9410 is powered- down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Data Registers Each potentiometer has four 6-bit nonvolatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the associated Wiper Counter Register. All operations changing data in one of the Data 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, the Data Registers can be used as regular memory locations for system parameters or user preference data. Data Register Detail Figure 1. Detailed Potentiometer Block Diagram (MSB) (LSB) D5 D4 D3 D2 D1 D0 NV NV NV NV NV NV Serial Data Path From Interface Circuitry Register 0 Register 1 Register 2 Register 3 Serial Bus Input Parallel Bus Input Wiper Counter Register INC/DEC Logic UP/DN CLK Modified SCL UP/DN VH/RH VL/RL VW/RW If WCR = 00[H] then VW/RW = VL/RL If WCR = 3F[H] then VW/RW = VH/RH 8 6 C o u n t e r D e c o d e (WCR) (One of Two Arrays) X9410 |
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