參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 136/164頁
文件大?。?/td> 621K
代理商: 37C669
73
SERIAL PORT (UART)
The FDC37C669 incorporates two full function
UARTs.
They
are
compatible
with
the
NS16450, the 16450 ACE registers and the
NS16550A.
The UARTs
perform
serial-to-
parallel conversion on received characters and
parallel-to-serial
conversion
on
transmit
characters.
The data rates are independently
programmable from 115.2K baud down to 50
baud. The character options are programmable
for 1 start; 1, 1.5 or 2 stop bits; even, odd, sticky
or no parity; and prioritized interrupts. The
UARTs each contain a programmable baud rate
generator that is capable of dividing the input
clock or crystal by a number from 1 to 65535.
The UARTs are also capable of supporting the
MIDI data rate. Refer to the FDC37C669
Configuration Registers
for information on
disabling, power down and changing the base
address of the UARTs.
The interrupt from a
UART is enabled by programming OUT2 of that
UART to a logic "1".
OUT2 being a logic "0"
disables that UART's interrupt.
REGISTER DESCRIPTION
Addressing of the accessible registers of the
Serial
Port
is
shown
below.
The
base
addresses of the serial ports are defined by the
configuration
registers
(see
Configuration
section). The Serial Port registers are located at
sequentially increasing addresses above these
base addresses. The FDC37C669 contains two
serial ports, each of which contain a register set
as described below.
Table 31 - Addressing the Serial Port
DLAB*
A2
A1
A0
REGISTER NAME
0
Receive Buffer (read)
0
Transmit Buffer (write)
0
1
Interrupt Enable (read/write)
X
0
1
0
Interrupt Identification (read)
X
0
1
0
FIFO Control (write)
X
0
1
Line Control (read/write)
X
1
0
Modem Control (read/write)
X
1
0
1
Line Status (read/write)
X
1
0
Modem Status (read/write)
X
1
Scratchpad (read/write)
1
0
Divisor LSB (read/write)
1
0
1
Divisor MSB (read/write)
*NOTE: DLAB is Bit 7 of the Line Control Register
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