Instructions for Use:

1. Power Supply:

   • Connect the Vdd pin to the positive supply voltage (2.0V to 5.5V).
   • Connect the Vss pin to ground (0V).

2. Oscillator Configuration:

   • Choose the appropriate oscillator type (LP, XT, HS, etc.) based on your application.
   • Connect the external components (crystal, capacitors) as specified in the datasheet.

3. Programming:

   • Use a PIC programmer compatible with the PIC16F690 to program the device.
   • Ensure the device is configured for Low-Voltage Programming (LVP) if needed.

4. I/O Configuration:

   • Configure the I/O pins as inputs or outputs using the TRIS registers.
   • Set the direction of each pin using the TRISx register (0 for output, 1 for input).

5. Analog-to-Digital Converter (ADC):

   • Enable the ADC module and select the desired channel.
   • Configure the ADC settings (resolution, reference voltage, etc.) using the ADCONx registers.

6. Timers:

   • Initialize the timers by setting the prescaler and postscaler values.
   • Start the timer by setting the appropriate bits in the TMRx registers.

7. Interrupts:

   • Enable interrupts globally by setting the GIE bit in the INTCON register.
   • Enable specific interrupt sources by setting the corresponding bits in the PIE and PIR registers.

8. Serial Communication (USART):

   • Configure the USART module for the desired baud rate and communication mode (asynchronous/synchronous).
   • Initialize the TX and RX pins and enable the USART module.

9. Watchdog Timer (WDT):

   • Enable the WDT by setting the WDTE bit in the configuration word.
   • Clear the WDT periodically to prevent a reset.

10. Brown-out Reset (BOR):

    • Enable the BOR by setting the BOREN bit in the configuration word.
    • Set the desired BOR threshold level.

11. Power Management:

    • Use sleep mode to reduce power consumption by setting the SLEEP bit in the WDTCON register.
    • Wake up from sleep using an interrupt or external event.

12. Write Protection:

    • Enable write protection for the program memory and data EEPROM to prevent accidental changes.
    • Set the appropriate configuration bits to enable write protection.

For detailed information and specific register configurations, refer to the official PIC16F690 datasheet.