05218704 is referenced by 242 patents and cites 14 patents.

A real-time power conservation apparatus and method for portable computers employs a monitor to determine whether a CPU may rest based upon a real-time sampling of the CPU activity level and to activate a hardware selector to carry out the monitor's determination. If the monitor determines the CPU may rest, the hardware selector reduces CPU clock time; if the CPU is to be active, the hardware selector returns the CPU to its previous high speed clock level. Switching back into full operation from its rest state occurs without a user having to request it and without any delay in the operation of the computer while waiting for the computer to return to a "ready" state. Furthermore, the monitor adjusts the performance level of the computer to manage power conservation in response to the real-time sampling of CPU activity. Such adjustments are accomplished within the CPU cycles and do not affect the user's perception of performance and do not affect any system application software executing on the computer.

Title
Real-time power conservation for portable computers
Application Number
7/429270
Publication Number
5218704
Application Date
October 30, 1989
Publication Date
June 8, 1993
Inventor
Steven J Wallace
Temple
TX, US
LaVaughn F Watts Jr
Temple
TX, US
Agent
Richard L Donaldson
James C Kesterson
Ronald O Neerings
Assignee
Texas Instruments
TX, US
IPC
G06F 1/32
G06F 1/04
View Original Source