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X9118TV14 Datasheet(PDF) 7 Page - Intersil Corporation |
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X9118TV14 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 20 page 7 FN8161.1 March 25, 2005 Table 3. Instruction Set Instruction and Register Description DEVICE ADDRESSING WIPER COUNTER REGISTER (WCR) The X9118 contains a Wiper Counter Register (see Table 4) for the XDCP potentiometer. The WCR is equivalent to a serial-in, parallel-out register/counter with its outputs decoded to select one of 1024 switches along its resistor array. The contents of the WCR can be altered in one of three ways: (1) it may be written directly by the host via the write Wiper Counter Register instruction (serial load); (2) it may be written indirectly by transferring the contents of one of four associated Data Registers via the XFR Data register; (3) it is loaded with the contents of its Data Register zero (R0) upon power-up. The Wiper Counter Register is a volatile register; that is, its contents are lost when the X9118 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. Power-up guidelines are recommended to ensure proper loadings of the DR0 value into the WCR . DATA REGISTERS (DR) The potentiometer has four 10-bit non-volatile 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 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. Bit 9–Bit 0 are used to store one of the 1024 wiper position (0 ~1023). Register Selected RB RA DR0 0 0 DR1 0 1 DR2 1 0 DR3 1 1 Instruction Instruction Set Operation R/W I2 I1 I0 0RB RA 0 0 Read Wiper Counter Register 1 1 0 0 0 0 0 0 0 Read the contents of the Wiper Counter Register Write Wiper Counter Register 0 1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register Read Data Register 1 1 0 1 0 1/0 1/0 0 0 Read the contents of the Data Register pointed to RB-RA. Write Data Register 0 1 1 0 0 1/0 1/0 0 0 Write new value to the Data Register pointed to RB-RA. XFR Data Register to Wiper Counter Register 1 1 1 0 0 1/0 1/0 0 0 Transfer the contents of the Data Register pointed to by RB-RA to the Wiper Counter Register XFR Wiper Counter Register to Data Regis- ter 0 1 1 1 0 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register to the Data Register pointed to by RB-RA. Note: (1) 1/o = data is one or zero. X9118 |
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