CIRCC datasheet(39/70 Pages) SMSC

39 / 70 page

ACE UART

The SMSC CIrCC 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

the

device

data

sheet

for

the

information

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 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 CIrCC UART register set

is described below.

Table 26 - 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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