MCP2140_13 datasheet(8/58 Pages) MICROCHIP

Part #	MCP2140

Description	IrDA짰 Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

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Manufacturer	MICROCHIP [Microchip Technology]

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MCP2140

DS21790B-page 8

Preliminary

 2003-2012 Microchip Technology Inc.

2.3.1.2

External Clock

For applications where a clock is already available

elsewhere, users may directly drive the MCP2140 pro-

vided that this external clock source meets the AC/DC

timing requirements listed in Section 4.3, “Timing Dia-

grams and Specifications”. Figure 2-2 shows how an

external clock circuit should be configured.

FIGURE 2-2:

EXTERNAL CLOCK

2.3.2

BIT CLOCK

The device crystal is used to derive the communication

bit clock (BITCLK). There are 16 BITCLKs for each bit

time. The BITCLKs are used for the generation of the

start bit and the eight data bits. The stop bit uses the

BITCLK when the data is transmitted (not for

reception).

This clock is a fixed-frequency and has minimal

variation in frequency (specified by the crystal

manufacturer).

Clock From

external

MCP2140

OSC1

OSC2

Open

system

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