MCP2140 データシートの表示（PDF） - Microchip Technology

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MCP2140

IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

Microchip Technology 

MCP2140

2.7 IrDA DATA PROTOCOLS

SUPPORTED BY MCP2140

The MCP2140 supports these required IrDA standard

protocols:

• Physical Signaling Layer (PHY)

• Link Access Protocol (IrLAP)

• Link Management Protocol/Information Access

Service (IrLMP/IAS)

The MCP2140 also supports some of the optional pro-

tocols for IrDA standard data. The optional protocols

implemented by the MCP2140 are:

• Tiny TP

• IrCOMM

Figure 2-7 shows the IrDA data protocol stack and

those components implemented by the MCP2140.

FIGURE 2-7:

IrDA DATA - PROTOCOL

STACKS

IrTran-P IrObex IrLan IrComm (1) IrMC

LM-IAS Tiny Transport Protocol (Tiny TP)

IR Link Management - Mux (IrLMP)

IR Link Access Protocol (IrLAP)

Asynchronous Synchronous Synchronous

Serial IR (2, 3)

Serial IR

4 PPM

(9600 -115200 b/s) (1.152 Mb/s) (4 Mb/s)

Supported by

the MCP2140

Optional IrDA data

protocols not

supported by

the MCP2140

Note 1: The MCP2140 implements the 9-wire

“cooked” service class serial replicator.

2: The MCP2140 is fixed at 9600 baud

3: An optical transceiver is required.

2.7.1 IRCOMM

IrCOMM provides the method to support serial and par-

allel port emulation. This is useful for legacy COM

applications, such as printers and modem devices.

The IrCOMM standard is a syntax that allows the Pri-

mary device to consider the Secondary device a serial

device. IrCOMM allows for emulation of serial or paral-

lel (printer) connections of various capabilities. The

MCP2140 supports the 9-wire “cooked” service class of

IrCOMM. Other service classes supported by IrCOMM

are shown in Figure 2-8.

The IrDA protocol for printer support is not included in

the IrCOMM 9-wire “cooked” service class.

FIGURE 2-8:

IRCOMM SERVICE CLASSES

IrCOMM Services

Uncooked Services

Cooked Services

Parallel

IrLPT

Serial

3-wire Raw

Supported by MCP2140

Parallel

Centronics

IEEE 1284

Serial

3-wire Cooked

9-wire Cooked

 2003 Microchip Technology Inc.

Preliminary

DS21790A-page 13

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