MCP2120 datasheet(52/64 Pages) MICROCHIP

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MCP2120/MCP2150 USER’S GUIDE

DS51246A-page 48

 2001 Microchip Technology Inc.

A.5 Oscillator Options

The MCP2120 can be operated at different frequencies, while the MCP2150

only operates at a single fixed frequency.

A.5.1

MCP2120 Developer’s Board

The MCP2120 Developer’s Board crystal has pin receptacles so that crystal

frequencies can easily be changed. Table A.1 shows the baud rates for a

given crystal frequency, based on the state of the BAUD2:BAUD0 pins.

Table A.1: Crystal Frequency / Baud Rate

A.5.2

MCP2150 Developer’s Board

The MCP2150 Developer’s Board requires a fixed frequency crystal

(11.0592 MHz).

Table A.2: Crystal Frequency / Baud Rate

BAUD2:BAUD0

Bit Rate

FOSC Frequency (MHz)

0.6144 (1)

2.000

3.6864

4.9152

7.3728

14.7456 (2) 20.000 (2)

000

FOSC / 768

800

2604

4800

6400

9600

19200

26042

001

FOSC / 384

1600

5208

9600

12800

19200

38400

52083

010

FOSC / 192

3200

10417

19200

25600

38400

78600

104167

011

FOSC / 128

4800

15625

28800

38400

57600

115200

156250

100

FOSC / 64

9600

31250

57600

78600

115200

230400

312500

Note 1:

An external clock is recommended for frequencies below 2 MHz.

Note 2:

For frequencies above 7.5 MHz, the TXIR pulse width (

MCP2120 Data Sheet electrical specification

parameter IR121) will be shorter than the minimum pulse width of 1.6 µs in the IrDA standard specifica-

tion.

BAUD1:BAUD0

Bit Rate

FOSC Frequency -

11.0592 MHz

FOSC / 1152

9600

FOSC / 576

19200

FOSC / 192

57600

FOSC / 96

115200

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