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DM336P датащи(PDF) 11 Page - List of Unclassifed Manufacturers

номер детали DM336P
подробное описание детали  V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set
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производитель  ETC [List of Unclassifed Manufacturers]
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DM336P датащи(HTML) 11 Page - List of Unclassifed Manufacturers

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DM336P
V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set
Final
11
Version: DM336P-DS-F02
August 15, 2000
d. FIFO Control Register (FCR): Address 2
Reset State 00h , write only
bit7
bit6 bit
5
bit
4
bit3
bit2
bit1
bit0
RCVR
Trig
(MSB)
RCVR
Trig
(LSB)
00
DMA
Mode
TxFIFO
Reset
RxFIFO
Reset
FIFO
Enabl
e
This is a write only register at the same location as
the IIR, which is a read only register. This register is
used to enable the FIFOs, clear the the FIFOs, set the
RxFIFO trigger level, and select the type of DMA
signal.
Bit 0: Writing a 1 to FCR0 enables both transmit and
receive FIFOs. Resetting FCR0 will clear all
bytes in both FIFOs. When changing from FIFO
mode to Character mode (and vice versa), data
is automatically cleared from the FIFOs.
Bit 1: Writing a 1 to FCR1 clears all bytes in the
RxFIFO and resets its counter logic to 0.
Bit 2: Writing a 1 to FCR2 clears all bytes in the
TxFIFO and resets its counter logic to 0.
Bit 3: Setting FCR3 to 1 will cause the RXRDY and
TXRDY pins to change from mode 0 to mode 1
if FCR0 = 1.
Bit 4-5: Reserved
Bit 6-7: FCR6, FCR7 are used to set the trigger level
for the RxFIFO interrupt.
FCR6
FCR7
RxFIFO Trigger Level
00
01
01
04
10
08
e. Line Control Register (LCR): Address 3
Reset State 00h, Write Only
bit7
bit6
bit5 bit4 bit3 bit2
bit1
bit0
DLAB SBRK STP EPS PEN STB WLS1 WLS0
This register is available to maintain compatibility with
the standard 16550 register set, and provides
information to the internal hardware that is used to
determine the number of bits per character.
WLS1
WLS2
Word Length
00
5 bits
01
6 bits
10
7 bits
11
8 bits
Bit 0-1: WLS0-1 specifies the number of bits in each
transmitted and received serial character.
Bit 2: This bit specifies the number of stop bits in
each transmitted character. If bit 2 is a logic 0,
one stop bit is generated in the transmitted data.
If bit 2 is a logic 1 when a 5-bit word length is
selected via bits 0 and 1, one and a half stops
are generated. If bit 2 is a logic 1 when either a
6-, 7- or 8-bit word length is selected, two stop
bits are generated. The Receiver checks the
first Stop-bit only, regardless of the number of
Stop bits selected.
Bit 3: Logic 1 indicates that the PC has enabled the
parity generation and checking.
Bit 4: Logic 1 indicates that the PC is requesting an
even number of logic 1s to be transmitted or
checked. Logic 0 indicates that the PC is
requesting odd parity generation and checking.
Bit 5: When bit 3, 4 and 5 are logic 1, the parity bit is
transmitted and checked by the receiver as
logic 0. If bits 3 and 5 are 1 and bit 4 is logic 0,
then the parity is transmitted and checked as
logic 1.
Bit 6: This is a Break Control bit. When it is set to
logic 1, a break condition is indicated.
Bit 7: The Divisor Latch Access bit must be set to
logic 1 to access the Divisor Latches of the
baud generator during a read or write operation.
It must be set to logic 0 to access the Receiver
Buffer, the Transmitter Holding Register, or the
Interrupt Enable Register.


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