Method and apparatus for controlling show cycles in a data proce

Details Method and apparatus for controlling show cycles in a data proce Method and apparatus for controlling show cycles in a data proce

1995-06-02

1997-10-07

Auve, Glenn A.

Excavating

371 221, 395568, G06F 900

Patent

active

056757492

ABSTRACT:
The present invention relates in general to a data processing system (10), and more particularly to a method and apparatus for controlling showcycles in a data processing system (10) to provide user control over the tradeoff between internal bus visibility and operating performance. In one embodiment, the functionality of one or more register control bits (100, 102) can be combined with the functionality of one or more externally provided signals (78) to allow the user to have a wide range of control over the show cycles provided on external bus 12. The user is thus able to continuously select and change which information is provided by way of show cycles on external bus 12. As a result, the difficulty of debugging software program code can potentially be reduced.

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Motorola, Inc., MC8HC16 Family, "MC68HC161Y1 User's Manual," pp. 4-5; 4-6; 4-42; A-22.
Motorola, Inc., MC68H16 Family, "MC68HC16Z1 User's Manual," 1992, pp. 4-4 to 4-5; 4-59 to 4-60; A-22.
Motorola, Inc., M68300 Family, "MC68332 User's Manual," 1993, pp. 4-4; 4-43; A-20.

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