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UART Mode A / Mode B / Operational Mode

Joseph Lee1
Prodigy 160 points

Hi,

In the AM335x TRM, there are 3 modes defined for UART. They are Mode A, Mode B and Operational Mode.

After reading the TRM, it is still unclear the differences between Mode A and Mode B?

And under what circumstance or when should we use Mode A and Mode B.

Can anyone help me out.

Thanks.

From Joseph Lee

  • 0
    Prodigy 20 points
    From the TRM:
    "Register access depends on the register access mode, although register access modes are not correlated
    to functional mode selection. Three different modes are available:
    • Operational mode
    • Configuration mode A
    • Configuration mode B
    Operational mode is the selected mode when the function is active; serial data transfer can be performed
    in this mode.
    Configuration mode A and configuration mode B are used during module initialization steps. These modes
    enable access to configuration registers, which are hidden in the operational mode. The modes are used
    when the module is inactive (no serial data transfer processed) and only for initialization or reconfiguration
    of the module."
    The specific registers are defined in the TRM.