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ST16C550CJ44 Scheda tecnica(PDF) 11 Page - Exar Corporation

Il numero della parte ST16C550CJ44
Spiegazioni elettronici  UART WITH 16-BYTE FIFO?셲
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ST16C550
11
Rev. 4.30
DMA Operation
The ST16C550 FIFO trigger level provides additional
flexibility to the user for block mode operation. The user
can optionally operate the transmit and receive FIFO’s
in the DMA mode (FCR bit-3). The DMA mode affects
the state of the -RXRDY and -TXRDY output pins. The
following tables show this:
-RXRDY pin:
Non-DMA mode
DMA mode
1 = FIFO empty
0 to 1 transition when FIFO
empties
0 = at least 1 byte
1 to 0 transition when FIFO
in FIFO
reaches trigger level, or
timeout occurs
-TXRDYpin:
Non-DMA mode
DMA mode
1 = at least 1 byte
1 = FIFO is full
in FIFO
0 = FIFO empty
0 = FIFO has at least 1
empty location
Loop-back Mode
The internal loop-back capability allows onboard diag-
nostics. In the loop-back mode the normal modem
interface pins are disconnected and reconfigured for
loop-back internally. In this mode MSR bits 4-7 are
also disconnected. However, MCR register bits 0-3
can be used for controlling loop-back diagnostic test-
ing. In the loop-back mode -OP1 and -OP2 in the MCR
register (bits 0-1) control the modem -RI and -CD
inputs respectively. MCR signals -DTR and -RTS (bits
0-1) are used to control the modem -CTS and -DSR
inputs respectively. The transmitter output (TX) and the
receiver input (RX) are disconnected from their associ-
ated interface pins, and instead are connected together
internally (See Figure 4). The -CTS, -DSR, -CD, and -RI
are disconnected from their normal modem control
inputs pins, and instead are connected internally to -
DTR, -RTS, -OP1 and -OP2. Loop-back test data is
entered into the transmit holding register via the user
data bus interface, D0-D7. The transmit UART serial-
izes the data and passes the serial data to the receive
UART via the internal loop-back connection. The receive
UART converts the serial data back into parallel data
that is then made available at the user data interface,
D0-D7. The user optionally compares the received data
to the initial transmitted data for verifying error free
operation of the UART TX/RX circuits.
In this mode , the receiver and transmitter interrupts are
fully operational. The Modem Control Interrupts are also
operational. The interrupts are still controlled by the
IER.
Figure 3, TYPICAL EXTERNAL CRYSTAL OSCILLA-
TOR CONNECTION
C1
22-47pF
C2
22-47pF
Y1
1.8432 - 24 M H z
R1
0-120
(O ptional)
R2
1M
XT AL 1
X T A L 2


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