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X9279TV14I-2.7 Datasheet(PDF) 9 Page - Xicor Inc. |
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X9279TV14I-2.7 Datasheet(HTML) 9 Page - Xicor Inc. |
9 / 24 page X9279 Characteristics subject to change without notice. 9 of 24 REV 1.1.7 2/6/03 www.xicor.com Table 3. Instruction Set Note: 1/0 = data is one or zero Instruction Instruction Set Operation I3 I2 I1 I0 RB RA P1 P0 Read Wiper Counter Register 1001 0 0 0 0 Read the contents of the Wiper Counter Register Write Wiper Counter Register 1010 0 0 0 0 Write new value to the Wiper Counter Register Read Data Register 1011 1/0 1/0 1/0 1/0 Read the contents of the Data Register pointed to by P1-P0 and RB-RA Write Data Register 1100 1/0 1/0 1/0 1/0 Write new value to the Data Register pointed to by P1-P0 and RB-RA XFR Data Register to Wiper Counter Register 1101 1/0 1/0 0 0 Transfer the contents of the Data Register pointed to by RB-RA (Bank 0 only) to the Wiper Counter Register XFR Wiper Counter Register to Data Register 1110 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register to the Register pointed to by RB-RA (Bank 0 only) Increment/Decrement Wiper Counter Register 0010 0 0 0 0 Enable Increment/decrement of the Wiper Counter Register DEVICE DESCRIPTION Wiper Counter Register (WCR) The X9279 contains contains a Wiper Counter Register, for the DCP potentiometer. The Wiper Counter Register can be envisioned as a 8-bit parallel and serial load counter with its outputs decoded to select one of 256 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 instruction (parallel load); it can be modified one step at a time by the Increment/Decrement instruction (see Instruction section for more details). 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 X9279 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. The DR0 value of Bank 0 is the default value. Data Registers (DR) The potentiometer has four 8-bit nonvolatile Data Registers (DR3-DR0). 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. Bit [7:0] are used to store one of the 256 wiper positions (0~255). |
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