对 TPL0102 执行的 配置数据, 好像 Non-volatile 保存 不 成功: 掉电重启以后, 读取的, 仍是 默认值

The TPL0102 has non-volatile memory (EEPROM) which can be used to store the wiper position. When the device is powered down, the last value stored in the Initial Value Register (IVR) will be maintained in the non-volatile memory. When power is restored, the contents of the IVR are automatically recalled and loaded into the corresponding WR register to set the wipers . The internal registers of the TPL0102 can be accessed using the I2C interface. The factory-programmed default value for the IVR upon power up is 0x80h (1000 0000). The WR register can be written to directly without first writing to the IVR, depending upon the setting of the volatile memory (VOL) in the ACR (Access Control Register). If the WR register is written to directly without writing to the IVR as well, this results in the wiper position changing to a desired position, but the position will not be stored in memory and will not be reloaded upon powering up the device.

As stated in the Overview, the VOL bit from the ACR (Access Control Register) provides two options for register accessibility. Either only volatile registers (WR) are accessible to change the wiper setting without storing the value in non-volatile memory or volatile registers (WR) and non-volatile registers (IVR) are accessible to change the wiper setting, which allows the value to be stored in non-volatile memory.