Microprocessor with OEM mode for power management with input/out

Details Microprocessor with OEM mode for power management with input/out Microprocessor with OEM mode for power management with input/out

Filed on

1991-07-05

Date issued

1993-12-28

Examiner

Anderson, Lawrence E.

Patent Class

Boots, shoes, and leggings

Other Related Categories

395750, 395275, 364DIG1, 3642731, 3642329, G06F 1310, G06F 1300

Type

Patent

Status

active

Patent number

052747913

Description

ABSTRACT:
The present invention provides a microprocessor with a special OEM mode of operation that can be used by an OEM system integrator to implement special tasks such as power management. The OEM mode provided by the present invention is designed for use by a system integrator who integrates a microprocessor into a larger system such as a personal computer. The OEM mode of operation provided by this invention adds features to the overall system; however, it is transparent to system programmers. The system integrator can use the OEM mode to configure a system so that the system has certain special power management features, which can not be accessed by programmers who use the system. The OEM mode provided by the present invention is accessed by a signal on a special I-O pin. For example, an external timer can periodically provide signals to this special pin, thereby periodically interrupting the microprocessor and putting the microprocessor in the OEM mode. Special power management code stored in an external ROM can be executed each time the microprocessor is placed in OEM mode. At the end of the operations performed in OEM mode, the microprocessor is restored to the state where the OEM mode of operation began.

REFERENCES:
patent: 4030073 (1977-06-01), Armstrong, Jr.
patent: 4591982 (1986-05-01), Buonomo et al.
patent: 4736290 (1988-04-01), McCallion
patent: 4926322 (1990-05-01), Stimac et al.

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