JPS63103134U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of an abnormality detection device for a keyboard control device showing an embodiment of this invention, and FIG. 2 is a waveform diagram illustrating a clock signal output from the clock circuit shown in FIG. 1. , 3rd
The figure is a flowchart explaining the abnormality detection control operation procedure of the keyboard controller according to this invention.
FIG. 4 is a block diagram illustrating the main part of an abnormality detection device for a keyboard control device showing another embodiment of the present invention. In the figure, 1 is a keyboard controller, 2 is a key matrix contact, 3 is an I/O bus, 4 is a data bus, 5 is a microprocessor, 6 is a memory, and 7 is a clock circuit.

Claims (1)

[Claims for Utility Model Registration] (1) In a keyboard control device that interfaces processing data obtained by command-processing key input signals input from a keyboard to a microprocessor based on data stored in a register in advance, a signal generating means for outputting a clock signal alternating in synchronization with a key input read cycle of the keyboard commanded by a microprocessor to an arbitrary key contact point of the keyboard; and the arbitrary key set by the signal generating means. The present invention is characterized by comprising a key register that stores a contact signal indicating a pressed state of a contact, and a signal determination means that determines alternating nature of the contact signal written to the key register every key input reading cycle of the keyboard. Abnormality detection device for keyboard control device. (2) The keyboard control according to claim 1, wherein the signal determining means resets the data stored in the register based on the alternating state of the contact signal written in the key register. Equipment abnormality detection device.