User manual

MCP250XX USER’S GUIDE

 2004 Microchip Technology Inc. DS51266C-page 23

Chapter 3. MCP250XX Register View Tutorial

3.1 INTRODUCTION

A few topics covered in this chapter were also covered in the last chapter detailing the

Basic template tutorial. To avoid duplication, the appropriate sections of Chapter 2

“MCP250XX Basic View Tutorial” will be referenced.

This chapter details the demonstration software (Register template) and CAN system

(PC Node and Node B). It also covers the steps required to successfully communicate

with the MCP250XX while in the Register template.

3.2 HIGHLIGHTS

This chapter covers the following topics:

• Setting up the Evaluation Mode

• Establishing Communications

• Explaining the Windows

3.3 SETTING UP THE REGISTER TEMPLATE EVALUATION MODE

The MCP250XX Development Kit’s “Register” template contains the following major

elements that will be discussed, in detail, later in this chapter:

1. The Menu Bar, PC Node Bit Timing and Mode and Board Status windows are

all discussed in Section 2.3 “Setting up the Basic Template Evaluation

Mode”.

2. MCP250XX Filters – Used to set up and test the MCP250XX mask and filters.

3. MCP250XX Error Status – Used to read the current Transmit and Receive Error

Counters (TEC and REC), as well as the EFLG register.

4. MCP250XX Physical Layer – Displays the bit timing registers (CNF1, CNF2 and

CNF3).

5. MCP250XX Command Messages – Implements the command messages as

described in the data sheet. Information Request Messages (IRM), output and

input messages are all represented in this window to enable the main

functionality of the MCP250XX.

Note: The software must be installed, and the hardware connected, to run the

demonstration program.