Microcomputer having a system clock frequency that varies in dep

Details Microcomputer having a system clock frequency that varies in dep Microcomputer having a system clock frequency that varies in dep

1993-09-29

1995-02-21

Harvey, Jack B.

Boots, shoes, and leggings

395550, 3642302, 364DIG1, G06F 108

Patent

active

053924355

ABSTRACT:
A microcomputer provided with improved interrupt handling. The frequency of a clock signal supplied to the central processing unit is increased to shorten the interrupt holding time when relatively many interrupts are occurring. When few interrupts are occurring, the frequency of the clock signal is decreased thereby reducing power consumption. The invention includes a holding factors register for storing the number of interrupt factors being held by an interrupt controller and an interrupt nesting counter for storing the number of nested interrupts in the central processing unit. The numbers stored in the holding factors register and interrupt nesting counter are compared to preset numbers. A clock control circuit changes the frequency of the system clock signal in accordance with the comparison result thereby changing the frequency of the clock signal depending on the number of occurrences of interrupts.

REFERENCES:
patent: 3594732 (1971-07-01), Mendelson
patent: 4023143 (1977-05-01), Braunstein
patent: 4488227 (1984-12-01), Min et al.
patent: 4636944 (1987-01-01), Hodge
patent: 4987529 (1991-01-01), Craft et al.
patent: 5047919 (1991-09-01), Sterling et al.
patent: 5115506 (1992-05-01), Cohen et al.
patent: 5161226 (1992-11-01), Wainer
patent: 5163146 (1992-11-01), Antanaitis, Jr. et al.
"Product Outline Report:NPC Series", Nikkei Data Processing, Jan. 1989, pp. MC2-303-651 thru MC2-303-654.

Affiliated with

Also associated with

Rating

Microcomputer having a system clock frequency that varies in dep does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microcomputer having a system clock frequency that varies in dep, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microcomputer having a system clock frequency that varies in dep will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1941171