PC87309VLJ datasheet(102/192 Pages) NSC

102 / 192 page

Enhanced Serial Port with IR -UART2 (Logical Device 2)

102

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5.0

Enhanced Serial Port with IR -

UART2 (Logical Device 2)

This module provides advanced, versatile serial communi-

cations features with infrared capabilities. It supports four

modes of operation: UART, Sharp-IR, IrDA 1.0 SIR (hereaf-

ter called SIR) and Consumer-IR (also called TV-Remote or

Consumer remote-control). In UART mode, the module can

function as a standard 16450 or 16550, or as an Extended

UART.

Existing 16550-based legacy software is completely and

transparently supported. Module organization and specific

fallback mechanisms switch the module to 16550 compati-

bility mode upon reset or when initialized by 16550 soft-

ware.

You can configure this module for either partial or full infra-

red communication support, as follows:

l Mode 1: Full-IR Mode (CFG0 = 0)

Fully IR-compliant device only. All the UART compli-

ance pins of UART2 are not available (i.e. the outputs

are not routed and the inputs are assumed inactive).

Any attempt to work with the port as a UART in this

mode has no effect.

l Mode 2: Two-UART Mode (CFG0 = 1)

Works as UART or as partially IR-compliant device. The

IR interface includes only two signals, IRTX and IRRX1.

The IRSL2-0 pins and ID3-0 inputs are not available in

this mode. Any attempt to work with IRRX2 and/or to

manipulate IRSL2-0 in this mode has no effect.

This module does not recognize the operation mode, and

there is no hardware protection against invalid usage or

configuration. The software must therefore avoid any invalid

operation of the UART2 in either one of these two modes.

This module includes two DMA channels; the device can

use either 1 or 2 of these channels. One channel is required

for infrared-based applications, since infrared communica-

tion works in half duplex fashion. Two channels would nor-

mally be needed to handle high-speed full duplex UART

based applications.

5.1

FEATURES

Fully compatible with 16550 and 16450 devices

Automatic fallback to 16550 compatibility mode

Extended UART mode

UART baud rates up to 1.5 Mbps

Sharp-IR with selectable internal or external modula-

tion/demodulation

IrDA 1.0 SIR with data rates up to 115.2 Kbps

Consumer-IR (TV-Remote) mode

Full duplex infrared capability for diagnostics

Transmission deferral (in Consumer-IR mode)

Selectable 16-level transmission and reception FIFOs

(RX_FIFO & TX_FIFO respectively)

Multiple optical transceiver support

Automatic or manual transceiver conﬁguration

Support for Plug-n-Play infrared adapters

5.2

FUNCTIONAL MODES OVERVIEW

This multi-mode module can be configured to act as any

one of several different functions. Although each mode is

unique, certain system resources and features are common

to some or to all modes.

5.2.1

UART Modes: 16450 or 16550, and Extended

UART modes support serial data communications with a re-

mote peripheral device or modem using a wired interface.

The device transmits and receives data concurrently in full-

duplex operation, performing parallel-to-serial and serial-to-

parallel conversion and other functions required to ex-

change parallel data with the system. It also interfaces with

external devices using a programmable serial communica-

tions format.

The following UART modes are supported:

16450 or 16550 mode (Non-Extended modes)

Extended mode

The 16450 or 16550 mode is functionally and software-

compatible with the standard 16450 or 16550 UARTs. This

is the default mode of operation after power up, after reset

or when initialized by software written for the 16450 or

16550 UART (Special mechanisms switch the module auto-

matically to 16550 UART mode when standard 16550 soft-

ware is run).

The 16550 UART mode has all the features of the 16450

mode, with the addition of 16-byte data FIFOs for more effi-

cient data I/O.

In Extended mode, additional features become available

that enhance the UART performance, such as additional in-

terrupts and DMA ability (see “Extended UART Mode” on

page 104).

The UART supports baud rates of up to 115.2 Kbps in 16450

or 16550 mode, and up to 1.5 Mbps in Extended mode.

5.2.2

Sharp-IR, IrDA SIR Infrared Modes

The Sharp-IR mode provides bidirectional communication

by transmitting and receiving infrared radiation. In this

mode, infrared I/O circuits was added to the UART, which

operates at 38.4 Kbps in half-duplex, using normal UART

serial data formats with Digital Amplitude Shift Keying

(DASK) modulation. The modulation/demodulation can be

operated internally or externally.

In SIR mode, the system functions similarly to the Sharp-IR

mode, but at 115.2 Kbps.

5.2.3

Consumer IR Mode

Consumer-IR mode supports all the protocols presently

used in remote-controlled home entertainment equipment:

RC-5, RC-6, RECS 80, NEC and RCA. The serial format is

not compatible with UART operation, and specific circuitry

performs all the hardware tasks required for signal condi-

tioning and formatting. The software is responsible for the

generation of the infrared code to be transmitted, and for the

interpretation of the received code.

5.3

Eight register banks, each containing eight registers, con-

trol UART operation. All registers use the same 8-byte ad-

dress space to indicate offsets 00h through 07h, and the

active bank must be selected by the software.

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