FDC37M607 datasheet(66/182 Pages) SMSC

66 / 182 page

SERIAL PORT (UART)

The FDC37M60x 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

transmit

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 UT2 of that UART to a logic

"1".

OUT2 being a logic "0" disables that

UART's interrupt.

The second UART also

supports IrDA, HP-SIR, and ASK-IR infrared

modes of operation.

Note: The UARTs may be configured to share

an interrupt. Refer to the Configuration section

for more information.

Addressing of the accessible registers of the

Serial

Port

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 FDC37M60x contains two

serial ports, each of which contain a register set

as described below.

Table 31 - Addressing the Serial Port

DLAB*

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)

*Note: DLAB is Bit 7 of the Line Control Register

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