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TL16C752BTPTREP Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części TL16C752BTPTREP
Szczegółowy opis  3.3-V DUAL UART WITH 64-BYTE FIFO
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TL16C752B-EP
3.3-V DUAL UART WITH 64-BYTE FIFO
SGLS153 – FEBRUARY 2003
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description (continued)
Table 4. Interrupt Control Functions
IIR[5–0]
PRIORITY
LEVEL
INTERRUPT
TYPE
INTERRUPT SOURCE
INTERRUPT RESET METHOD
000001
None
None
None
None
000110
1
Receiver line
status
OE, FE, PE, or BI errors occur in characters in
the RX FIFO
FE, PE, BI: All erroneous characters are read
from the RX FIFO.
OE: Read LSR
001100
2
RX timeout
Stale data in RX FIFO
Read RHR
000100
2
RHR interrupt
DRDY (data ready)
(FIFO disable)
RX FIFO above trigger level (FIFO enable)
Read RHR
000010
3
THR interrupt
TFE (THR empty)
(FIFO disable)
TX FIFO passes above trigger level (FIFO
enable)
Read IIR OR a write to the THR
000000
4
Modem status
MSR[3:0] = 0
Read MSR
010000
5
Xoff interrupt
Receive Xoff character(s)/special character
Receive Xon character(s)/Read of IIR
100000
6
CTS, RTS
RTS pin or CTS pin change state from active
(low) to inactive (high)
Read IIR
It is important to note that for the framing error, parity error, and break conditions, LSR[7] generates the interrupt.
LSR[7] is set when there is an error anywhere in the RX FIFO and is cleared only when there are no more errors
remaining in the FIFO. LSR[4 – 2] always represent the error status for the received character at the top of the
RX FIFO. Reading the RX FIFO updates LSR[4 – 2] to the appropriate status for the new character at the top
of the FIFO. If the RX FIFO is empty, then LSR[4 – 2] are all zeros.
For the Xoff interrupt, if an Xoff flow character detection caused the interrupt, the interrupt is cleared by an Xon
flow character detection. If a special character detection caused the interrupt, the interrupt is cleared by a read
of the LSR.
interrupt mode operation
In interrupt mode (if any bit of IER[3:0] is 1) the processor is informed of the status of the receiver and transmitter
by an interrupt signal, INT. Therefore, it is not necessary to continuously poll the line stats register (LSR) to see
if any interrupt needs to be serviced. Figure 5 shows interrupt mode operation.
1
1
1
1
IER
IIR
THR
RHR
IOW/IOR
INT
Processor
Figure 5. Interrupt Mode Operation


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