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# 1.1.9.3 Configuring The Library

USART Driver Library should be configured via MHC. The following figures show the MHC configuration window for USART driver and brief description.

Common User Configuration for all Instances

- Driver Mode:
  - Allows User to select the mode of driver(Asynchronous or Synchronous). This setting is common for all the instances.

Instance Specific User Configurations

USART Driver Configuration in Asynchronous Mode

USART Driver Configuration in Synchronous Mode

- PLIB Used:

  - Indicates the underlying USART/UART PLIB used by the driver.

- Number Of Clients:

  - The total number of clients that can open the given USART driver instance

- Transfer Queue Size:

  - Indicates the size of the transmit/receive queue for the given USART/UART driver instance.

  - Available only in Asynchronous mode of Operations

- Use DMA for Transmit?

  - Enables DMA For transmitting the data

  - DMA Channel For Transmit:

    - DMA Channel for transmission is automatically allocated in DMA configurations

- Use DMA for Receive?

  - Enables DMA For Receiving the data

  - DMA Channel For Receive:

    - DMA Channel for Receiving is automatically allocated in DMA configurations