MCP2120 datasheet(41/64 Pages) MICROCHIP

部品番号	MCP2120

部品情報	DEVELOPER?셎 KIT USER?셎 GUIDE

PDF	64 Pages

Scroll/Zoom	100%

メーカー	MICROCHIP [Microchip Technology]

ホームページ	http://www.microchip.com

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41 / 64 page

 2001 Microchip Technology Inc.

DS51246A-page 37

MCP2120 Tutorial

Figure 3.19: Debug Flowchart - MCP2120 Developer’s Board #1 Side

Set up digital oscilloscope to

capture waveform on first

falling edge (Start bit)

Debug Board #1

Type character in PC #1

Hyperterminal window

Data

appear on

Yes

MCP2120

TX pin?

Data

appear on

Yes

MCP2120

TXIR pin?

Goto

Debug Board #2

Problem with MCP2120

Verify device has power/ground

Try replacing with new MCP2120

Data

appear on

Yes

MAX232

R1IN pin?

Data

appear on

Yes

MAX232

R1OUT

Verify 3 pin header J4

is jumpered correctly

Verify that the connection from

PC #1 to Board #1 is good.

Try communication with

another serial device

(such as PICSTART Plus).

Ensure jumper JP4 is open

Ensure crystal oscillator is correct

frequency and operating

Ensure Baud Rate is correct

(jumpers JP1, JP2, and JP3)

MAX232 device

It appears that the

is damaged

pin?

MCP2120 データシート(PDF) 41 Page - Microchip Technology

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