Functional Description
19.3 Functional Description
19.3.1 Block Diagram
The UART/IrDA/CIR module can be divided into three main blocks:
•
FIFO management
•
Mode selection
•
Protocol formatting
FIFO management is common to all functions and enables the transmission and reception of data from
the host processor point of view.
There are two modes:
•
Function mode: Routes the data to the chosen function (UART, IrDA, or CIR) and enables the
mechanism corresponding to the chosen function
•
Register mode: Enables conditional access to registers
For more information about mode configuration, see
, Mode Selection.
Protocol formatting has three subcategories:
•
Clock generation: The 48-MHz input clock generates all necessary clocks.
•
Data formatting: Each function uses its own state-machine that is responsible for the transition
between FIFO data and frame data associated with it.
•
Interrupt management: Different interrupt types are generated depending on the chosen function:
–
UART mode interrupts: Seven interrupts prioritized in six different levels
–
IrDA mode interrupts: Eight interrupts. The interrupt line is activated when any interrupt is
generated (there is no priority).
–
CIR mode interrupts: A subset of existing IrDA mode interrupts is used.
In each mode, when an interrupt is generated, the UART_IIR register indicates the interrupt type.
In parallel with these functional blocks, a power-saving strategy exists for each function.
is the UART/IrDA/CIR block diagram.
3453
SPRUH73H – October 2011 – Revised April 2013
Universal Asynchronous Receiver/Transmitter (UART)
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