Interrupt-generating keyboard scanner using an image RAM

Details Interrupt-generating keyboard scanner using an image RAM Interrupt-generating keyboard scanner using an image RAM

1993-10-05

1995-01-31

Eng, David Y.

Boots, shoes, and leggings

364234, 3649286, G06F 302

Patent

active

053865847

ABSTRACT:
A system for assisting the scanning of a keyboard associated with a personal computer. The system comprises a logic circuit which interacts with the microcontroller and the keyboard to reduce power consumption by the personal computer as well as freeing the microcontroller to do other tasks. The logic circuit "interrupts" the microcontroller whenever keyboard activity is detected. An image RAM stores a pattern of current key closures to be compared in subsequent keyboard scans. A subsequent miscompare between the keyboard and the Image RAM indicates that keyboard activity has occurred. When no keys are pressed, scanning may be stopped. Any key closure will then generate an interrupt, and the microcontroller will restart scanning.

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