The AD5232 device provides a nonvolatile, dual-channel, digitally controlled variable resistor (VR) with 256-bit resolution. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. "The AD5232 allows multiple modes of operation and adjustment through general-purpose programming of a microcontroller. In the direct programming mode the pre-set RDAC registers from the microcontroller can be loaded directly. Another key operating mode allows the RDAC registers to be combined with The settings previously stored in the EEMEM are refreshed. When the RDAC register is changed to establish a new wiper position, the set value can be saved to the EEMEM to perform an EEMEM save operation. Once the settings are saved in the EEMEM register these values will be automatically transferred to the RDAC register set Wiper position on system power-up. This operation is enabled by the internal preset flash and the preset can also be accessed externally. The contents of all internal registers can be read out of the serial data output (SDO). This includes the RDAC1 and RDAC2 registers, the corresponding non- Volatile EEMEM1 and EEMEM2 registers, 14 alternate user EEMEM registers for constant storage. The AD5232 device provides a nonvolatile, dual-channel, digitally controlled variable resistor (VR) with 256-bit resolution. These devices perform the same electronic Adjustment functions as a potentiometer or variable resistor. "The AD5232 allows multiple modes of operation and adjustment through general programming of a microcontroller. In the direct programming mode the pre-set RDAC registers from the microcontroller can be loaded directly. Another key operating mode allows the RDAC register to be refreshed with the settings previously stored in the EEMEM. When the RDAC register is changed to establish a new wiper position, the set value can be saved to the EEMEM to perform an EEMEM save operation. Once the settings are saved in the EEMEM register these values are automatically transferred to the RDAC register to set the wiper position at system power-up. This operation is enabled by the internal preset flash and the preset can also be accessed externally. The contents of all internal registers can be read out of the serial data output (SDO). This includes the RDAC1 RDAC2 registers, the corresponding nonvolatile EEMEM1 and EEMEM2 registers, and 14 spare user EEMEM registers for constant storage.