Hi, my circuit is composed from a PIC16F15345 microcontroller and a MCP79411 RTC chip, connected with i2c, it has an own 32.768 crystal. The 16F15345 also drives deprez meters and LEDs with PWM signals. While the power of the main circuit is switched off, the RTC runs correctly (precise timing) from its backup 3V battery. But activating the power of the PIC and the PWM driving, the RTC has lost its correct operation, delaying 30 minutes per 12 hour! Any idea to fix is accepted...