IRCC datasheet(40/79 Pages) SMSC

40 / 79 page

ACE UART

The SMSC IrCC incorporates one full function

UART compatible with the NS16450, the 16450

ACE registers and the NS16550A. The UART

performs 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 UART contains a programmable

baud rate generator that is capable of dividing the

input clock or crystal by a number from 1 to 65535.

The UART is also capable of supporting the MIDI

data rate. Refer to the Configuration Register

section

the

SMSC

FDC37C669FR,

FDC37C93XFR, or FDC37C957FR data sheet for

information on disabling, power down and

changing the base address of the UART. The

interrupt

from

the

UART

enabled

programming OUT2 of the UART to a logic "1".

OUT2 being a logic "0" disables the UART's

interrupt.

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. The Serial Port registers are located at

sequentially increasing addresses above these

base addresses. The SMSC IrCC UART register

set is described below.

Table 27 - 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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