FDC37B782-NS Standard Microsystems (SMSC), FDC37B782-NS Datasheet - Page 81
FDC37B782-NS
Manufacturer Part Number
FDC37B782-NS
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.FDC37B782-NS.pdf
(249 pages)
Specifications of FDC37B782-NS
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FIFO POLLED MODE OPERATION
With FCR bit 0 = "1" resetting IER bits 0, 1, 2 or 3
or all to zero puts the UART in the FIFO Polled
Mode of operation.
XMITTER are controlled separately, either one or
both can be in the polled mode of operation. In this
mode, the user's program will check RCVR and
XMITTER status via the LSR. LSR definitions for
the FIFO Polled Mode are as follows:
-
-
Bit 0=1 as long as there is one byte in the
RCVR FIFO.
Bits 1 to 4 specify which error(s) have
occurred. Character error status is handled
Since the RCVR and
82
-
-
-
There is no trigger level reached or timeout
condition indicated in the FIFO Polled Mode,
however, the RCVR and XMIT FIFOs are still fully
capable of holding characters.
the same way as when in the interrupt
mode, the IIR is not affected since EIR bit
2=0.
Bit 5 indicates when the XMIT FIFO is empty.
Bit 6 indicates that both the XMIT FIFO and
shift register are empty.
Bit 7 indicates whether there are any errors in
the RCVR FIFO.
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