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X9271UV14I-2.7 Datasheet(PDF) 7 Page - Intersil Corporation |
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X9271UV14I-2.7 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 22 page 7 FN8174.3 June 23, 2011 DEVICE DESCRIPTION Wiper Counter Register (WCR) The X9271 contains a Wiper Counter Register (WCR) for the DCP potentiometer. The WCR can be envisioned as an 8-bit parallel and serial load counter, with its outputs decoded to select one of 256 switches along its resistor array (Table 1). The contents of the WCR can be altered in four ways: 1. It can be written directly by the host via the Write Wiper Counter Register instruction (serial load). 2. It can be written indirectly by transferring the contents of one of four associated data registers via the XFR Data Register instruction (parallel load). 3. It can be modified one step at a time by the Increment/ Decrement instruction. 4. 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 X9271 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 loading of the R0 value into the WCR. The DR0 value of Bank 0 is the default value. Data Registers (DR3–DR0) The potentiometer has four 8-bit nonvolatile Data Registers. These can be read or written directly by the host (Table 2). Data can also be transferred between any of the four Data Registers and the associated WCR. All operations changing data in one of the Data Registers are nonvolatile operations and 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. Bits [7:0] are used to store one of the 256 wiper positions or data (0 ~255). Status Register (SR) The 1-bit Status Register is used to store the system status (Table 3). WIP: Write In Progress status bit; read only. – WIP = 1 indicates that a high-voltage write cycle is in progress. – WIP = 0 indicates that no high-voltage write cycle is in progress . . TABLE 1. WIPER COUNTER REGISTER, WCR (8-bit), WCR[7:0]: Used to store current wiper position (Volatile, V) WCR7 WCR6 WCR5 WCR4 WCR3 WCR2 WCR1 WCR0 VVVVVVVV (MSB) (LSB) TABLE 2. DATA REGISTER, DR (8-BIT), DR[7:0]: Used to store wiper positions or data (Nonvolatile, NV) BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 NV NV NV NV NV NV NV NV MSB LSB TABLE 3. STATUS REGISTER, SR (WIP is 1-bit) WIP (LSB) X9271 |
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