SC16C2550 datasheet(24/46 Pages) PHILIPS

Part #	SC16C2550

Description	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder

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Manufacturer	PHILIPS [NXP Semiconductors]

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24 / 46 page

Philips Semiconductors

SC16C2550

Dual UART with 16 bytes of transmit and receive FIFOs and IrDA

encoder/decoder

Product data

Rev. 03 — 19 June 2003

24 of 46

9397 750 11621

7.6 Modem Control Register (MCR)

This register controls the interface with the modem or a peripheral device.

Table 17:

Modem Control Register bits description

Bit

Symbol

Description

7

MCR[7]

Reserved; set to ‘0’.

6

MCR[6]

IR enable.

Logic 0 = Enable the standard modem receive and transmit

input/output interface (normal default condition).

Logic 1 = Enable infrared IrDA receive and transmit inputs/outputs.

While in this mode, the TX/RX output/inputs are routed to the

infrared encoder/decoder. The data input and output levels will

conform to the IrDA infrared interface requirement. As such, while

in this mode, the infrared TX output will be a logic 0 during idle data

conditions.

5

MCR[5]

Reserved; set to ‘0’.

4

MCR[4]

Loop-back. Enable the local loop-back mode (diagnostics). In this

mode the transmitter output (TX) and the receiver input (RX), CTS,

DSR, CD, and RI are disconnected from the SC16C2550 I/O pins.

Internally the modem data and control pins are connected into a

loop-back data conﬁguration (see Figure 6). In this mode, the receiver

and transmitter interrupts remain fully operational. The Modem

Control Interrupts are also operational, but the interrupts’ sources are

switched to the lower four bits of the Modem Control. Interrupts

continue to be controlled by the IER register.

Logic 0 = Disable loop-back mode (normal default condition).

Logic 1 = Enable local loop-back mode (diagnostics).

3

MCR[3]

OP2/INT enable

Logic 0 = Forces INT (A-B) outputs to the 3-State mode and sets

OP2 to a logic 1 (normal default condition).

Logic 1 = Forces the INT (A-B outputs to the active mode and sets

OP2 to a logic 0.

2

MCR[2]

(OP1). OP1A/OP1B are not available as an external signal in the

SC16C2550. This bit is instead used in the Loop-back mode only. In

the loop-back mode, this bit is used to write the state of the modem RI

interface signal.

1

MCR[1]

RTS

Logic 0 = Force RTS output to a logic 1 (normal default condition).

Logic1=Force RTS output to a logic 0.

0

MCR[0]

DTR

Logic 0 = Force DTR output to a logic 1 (normal default condition).

Logic 1 = Force DTR output to a logic 0.

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