ADSP-214xx SHARC Processor Hardware Reference 20-15
UART Port Controller
Interrupt Routing
The following sections describe the various possibilities for routing a
UART interrupt to the interrupt vector table (IVT).
DPI
The UART interrupts are all combined into the digital peripheral inter-
face (DPI) interrupt. The DPI_IRPTL register determines whether an
interrupt is for the transmitter or receiver. Listing 20-1 shows an example
of how to enable the UART over the DPI.
Table 20-4. UART Interrupt Overview
Interrupt
Source
Interrupt Condition Interrupt
Completion
Interrupt
Acknowledge
Default IVT
DPI UART
(TX/RX)
– DMA RX/TX done
– Core RX buffer full
– Core TX buffer empty
– Core RX Error (overrun,
parity, framing, break)
– DMA RX Error (overrun,
parity, framing)
– Core/DMA 9-bit
addressing
Internal transfer
completion
For UART DMA:
Read to clear
DPI_IMASK
+ RTI instruction
For UART core
(RX INT): Read
to clear
UARTxIIR + RTI
instruction
P14I
UART
(TX/RX)
– DMA RX/TX done
– Core RX buffer full
– Core TX buffer empty
– Core RX Error (overrun,
parity, framing, break)
– DMA RX Error (overrun,
parity, framing)
– Core/DMA 9-bit
addressing
Internal transfer
completion
For UART DMA:
RTI instruction
For UART core
(RX INT): Read
to clear
UARTxIIR + RTI
instruction
Need to route
UARTTXI
UARTRXI
(PICRx) to
any PxxI
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