Break address detecting circuit

Details Break address detecting circuit Break address detecting circuit

1993-10-19

1994-11-22

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Comparing counts

371 19, H03K 2100

Patent

active

053675509

ABSTRACT:
A break address detecting circuit sets a breakpoint in debugging a program for microprocessor, a signal processor, or the like. A first register holds a stop address ADstp. A first counter is initialized by a reset signal and counts up clock pulses in synchronism with a clock signal indicative of an instruction execution cycle. A selector selects a program address when the program is debugged, or selects output data from the first counter in step-by-step operation. A first comparator outputs a comparison result signal CR which is of an active level when output data from the selector and output data from the first register agree with each other. A second counter is initialized by the reset signal and counts up the comparison result signal each time the comparison result signal is of an active level. A second register holds a stop count CVstp. A second comparator outputs a break signal of an active level when output data from the second counter and output data from the second register agree with each other.

REFERENCES:
patent: 5134701 (1992-07-01), Mueller et al.
patent: 5253206 (1993-10-01), Tanaka et al.
patent: 5257269 (1993-10-01), Hamauchi
patent: 5265004 (1993-11-01), Schultz et al.
patent: 5274831 (1993-12-01), Katsuta
patent: 5301275 (1994-04-01), Vanbuskirk et al.
patent: 5311461 (1994-05-01), Gallagher
patent: 5319645 (1994-06-01), Bassi et al.

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