User manual

MCP250XX Register View Tutorial
 2004 Microchip Technology Inc. DS51266C-page 27
3.3.2 Setting the Numeric Base for Bus Monitor Window
If the Select Formatters window is not visible, select it from the View menu. Highlight
(do not uncheck) “Standard Text Format” in the Select Formatters window. Click
Properties and check the desired numeric base (see Figure 2-8).
A few other items must be addressed before proper communication can occur, as
discussed in the next section.
3.4 ESTABLISHING COMMUNICATION
Because the method for establishing communications is exactly the same as the last
chapter, please refer to Section 2.4, “Establishing Communications”.
3.5 EXPLAINING THE REGISTER TEMPLATE WINDOWS
The Register template provides access to all of the user registers by using the
command messages as defined in the data sheet.
3.5.1 General Information
There are three different ways to enter values into the windows, depending on the
window function:
1. Entering byte value in the appropriate box.
2. Clicking up/down counters to increase/decrease the value by one.
3. Double-clicking the desired bit location to toggle the bit to its opposite state.
The register bit names will be displayed for the location directly under the mouse
pointer (Physical Layer and Configuration windows only).
3.5.2 MCP250XX Filters Window
The MCP250XX Filters window allows the user to read, modify and test the mask and
filters settings. Care must be taken when modifying the mask and filter settings, as all,
or partial communications with the MCP250XX may be lost due to improper filter and
mask settings.
Mask and filter settings can be tested against various identifiers simply by entering the
desired identifier in the Test Identifier window and pressing the “Test Buf” button. This
tests the entered identifier with the entered mask and filter settings, indicating pass/fail
for each filter.
Example 3.1: Figure 3-1 shows a test where the mask is configured to accept IDs of
Eh and Fh only (bit 0 = 0 = “don’t care”).