FDC37B80X SMSC [SMSC Corporation], FDC37B80X Datasheet - Page 66

• Manufacturer Part Number: FDC37B80X
• Description: PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
• Manufacturer: SMSC [SMSC Corporation]

The FDC37B80x incorporates two full function
UARTs.
NS16450, the 16450 ACE registers and the
NS16C550A.
parallel conversion on received characters and
parallel-to-serial
characters. The data rates are independently
programmable from 460.8K 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 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
They
*Note: DLAB is Bit 7 of the Line Control Register
DLAB*
The UARTS perform serial-to-
X
X
X
X
X
X
X
0
0
0
1
1
conversion
are
compatible
A2
OUT2
0
0
0
0
0
0
1
1
1
1
0
0
Table 29 - Addressing the Serial Port
on
A1
0
0
0
1
1
1
0
0
1
1
0
0
of
SERIAL PORT (UART)
with
transmit
A0
that
0
0
1
0
0
1
0
1
0
1
0
1
the
66
Receive Buffer (read)
Transmit Buffer (write)
Interrupt Enable (read/write)
Interrupt Identification (read)
FIFO Control (write)
Line Control (read/write)
Modem Control (read/write)
Line Status (read/write)
Modem Status (read/write)
Scratchpad (read/write)
Divisor LSB (read/write)
Divisor MSB (read/write
UART to a logic "1". OUT2 being a logic "0"
disables that UART's interrupt.
UART also supports IrDA 1.0, HP-SIR and ASK-
IR modes of operation.
Note: The UARTs may be configured to share
an interrupt. Refer to the Configuration section
for more information.
REGISTER DESCRIPTION
Addressing of the accessible registers of the
Serial Port is shown below.
addresses of the serial ports are defined by the
configuration
section). The Serial Port registers are located at
sequentially increasing addresses above these
base addresses. The FDC37B80x contains two
serial ports, each of which contain a register set
as described below.
REGISTER NAME
registers
(see
Configuration
The second
The base