Method and apparatus for controlling a microprocessor-based system
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United States of America Patent
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Apr 7, 1981
Issued Date -
N/A
app pub date -
Aug 6, 1979
filing date -
Aug 6, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a microprocessor-based system whose firmware controls a normal mode of operation and a factory-adjustment mode of operation. The sequencing in the two modes is controlled by branching in accordance with system-state tests performed during the sequencing. The factory-adjustment mode of operation never takes place during normal use of the system, and a branch to the factory-adjustment mode is controlled by forcing particular system-state test signals in the factory. Where no extra test pins are available, a branch to the factory-adjustment mode can be controlled by forcing two incompatible test signals, that is, by forcing an overall system state which cannot occur during normal operation.
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