Chapter 4 Hardware Reference; Pcb Description; Configuration Headers And Jumper Settings - Motorola M68EVB912B32 User Manual

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The EVB printed circuit board (PCB) is a 5.15 by 3.4 inch (13.1 by 8.64 cm) board with two

layers.

Most of the connection points on the EVB use headers spaced on 1/10-inch (2.54 mm) centers,

with the following exceptions:

• Subminiature D connector for the RS-232C interface

• External power-supply connections

For maximum flexibility, the EVB uses two types of jumper headers:

Factory-installed headers are those most likely to be used for configuration without

Cut-trace header footprints offer EVB hardware options that are less likely to be

Use of the cut-trace header footprints requires a thorough

understanding of the MCU and of the EVB hardware. Refer to the

MC68HC912B32 Technical Summary and to the EVB schematic

diagram for design information.

68EVB912B32UM/D

CHAPTER 4

HARDWARE REFERENCE

major alteration of the EVB's hardware operation. These headers

are populated, and the factory-installed jumpers on them are preset

for the default EVB hardware and firmware (D-Bug12)

configurations.

Table 4-1 lists these headers by function and

describes their default and optional jumper settings.

changed.

These footprints are not populated.

connection between pins is a trace on the PCB. To change a cut-

trace footprint, the PCB trace must be cut. To return to the original

configuration, a header and a jumper must be installed to re-

establish the shunt.

NOTE

HARDWARE REFERENCE

The default

4-1

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