# Solution: Configuring RB6 as Digital Output with Pull-up Disabled and Open-drain Enabled Let's break down the required configuration for the **RB6** pin on a PIC microcontroller (commonly used in microcontroller courses): 1. **Configure as Digital Output** 2. **Disable Weak Pull-up** 3. **Enable Open-drain** We'll use the relevant Special Function Registers (SFRs): | Register | Purpose | |---------------|----------------------------------| | `TRISB` | Data Direction ( = Output) | | `WPUB` | Weak Pull-up Enable (1 = enabled)| | `ODCONB` | Open-drain Control (1 = enabled) | ## Step 1: Set RB6 as Digital Output - **TRISB6** controls the direction of RB6: - `` = Output - `1` = Input ```c TRISBbits.TRISB6 = ; // Set RB6 as output ``` ## Step 2: Disable Weak Pull-up - **WPUB6** enables/disables the weak pull-up: - `` = Disabled - `1` = Enabled ```c WPUBbits.WPUB6 = ; // Disable weak pull-up on RB6 ``` ## Step 3: Enable Open-drain - **ODCONB6** controls the open-drain mode: - `` = Open-drain disabled (normal) - `1` = Open-drain enabled ```c ODCONBbits.ODCB6 = 1; // Enable open-drain on RB6 ``` > **Note:** Register and bit naming may vary slightly by device. The above are standard for many 8-bit PICs. --- ## Summary Table | **Register** | **Bit** | **Setting** | **Purpose** | |--------------|-----------|-------------|----------------------------| | TRISB | TRISB6 | | Output | | WPUB | WPUB6 | | Weak pull-up disabled | | ODCONB | ODCB6 | 1 | Open-drain enabled | --- ## Final Answer ```c TRISBbits.TRISB6 = ; // RB6 as output WPUBbits.WPUB6 = ; // Pull-up disabled ODCONBbits.ODCB6 = 1; // Open-drain enabled ``` **These settings configure RB6 as a digital output, disable its weak pull-up, and enable open-drain mode.**