IRCC2.0 datasheet(44/87 Pages) SMSC

44 / 87 page

ACE UART

The SMSC IrCC 2.0 incorporates one full function

UART compatible with the NS16450, the 16450

ACE registers and the NS16C550A. 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 of the device data sheet for information on

disabling, power down and changing the base

address of the UART.

The interrupt from the

UART is enabled by 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 configuration registers

define the base addresses of the serial ports. The

Serial Port registers are located at sequentially

increasing

addresses

above

these

base

addresses.

The SMSC IrCC 2.0 UART register

set is described below.

Table 30 - 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

IRCC2.0 Datasheet(PDF) 44 Page - SMSC Corporation

IRCC2.0 Datasheet(HTML) 44 Page - SMSC Corporation

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