Microcomputer development support system operable with only back

Details Microcomputer development support system operable with only back Microcomputer development support system operable with only back

1994-08-03

1996-08-06

Teska, Kevin J.

Boots, shoes, and leggings

395500, 395375, 3642328, 36424341, 36426791, G06F 900, G06F 1100

Patent

active

055443079

ABSTRACT:
A microcomputer development support system for a microprocessor, includes an instruction substituting circuit tracing a memory access performed by the microprocessor and substituting a predetermined branch instruction for an instruction which is read out from a predetermined address of a user memory by the microprocessor, and a background monitor configured to give the microprocessor a memory space which is separated from the user memory but is peculiar to the microcomputer development support system. After the predetermined branch instruction has been substituted and after a break acknowledge signal informing an execution of the predetermined branch instruction has been activated, the microcomputer development support system executes a program stored in the background monitor. At the same time, the microcomputer puts the cache memory into the "cache off" condition when it starts to execute the program of the background monitor. When the execution of the program of the background monitor is terminated, the microcomputer returns the cache memory into the "cache on" condition.

REFERENCES:
patent: 5249266 (1993-09-01), Dye et al.
patent: 5317711 (1994-05-01), Bourekas et al.
patent: 5321828 (1994-06-01), Phillips et al.
patent: 5446851 (1995-08-01), Yamaguchi
patent: 5455936 (1995-10-01), Maemura

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