Resume control system and method for executing resume processing while checking operation mode of CPU
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United States of America Patent
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Jan 4, 1994
Issued Date -
N/A
app pub date -
Mar 9, 1993
filing date -
Nov 30, 1989
priority date (Note) -
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Abstract
A CPU to be operable in at least first and second modes is used to execute a resume processing program set to be executed only in the first mode. In the case where resume processing is carried out if the power supplied from a power source is cut off when the CPU is operating in the second mode, the second mode is saved in a backup RAM, and the CPU is set to operate in the first mode in which the resume processing program can be executed. Upon restoration of the power source, restoring procedure is carried out. After the restoring procedure is completed, the CPU is set to operate in the second mode saved in the backup RAM, and resumes the interrupted processing.
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