Method of establishing a clock in the I/O card of a personal com

Details Method of establishing a clock in the I/O card of a personal com Method of establishing a clock in the I/O card of a personal com

1992-10-22

1993-08-31

Harrell, Robert B.

Boots, shoes, and leggings

364DIG2, 364950, 3649504, 3649505, 364270, 3642715, 3642719, G06F 104, G06F 108

Patent

active

052416470

ABSTRACT:
A method of establishing a clock for the UART circuit provided in a standard I/O card or a combined graphic and I/O card is disclosed. The essential step of the method of the invention is to directly impress the clock of the main board of a personal computer into the UART circuit of the I/O card thereby eliminating the need for an independent crystal for the UART circuit. In an alternative embodiment of the method according to the present invention, the clock for the graphic data processing circuit provided in a combined graphic and I/O card is impressed directly to the UART circuit provided in the same card. The method of establishing a clock in the I/O card also includes a step of processing the directly impressed clock, either from the main board of the personal computer or from the graphic data processing circuit, to obtain the desired clock for the UART circuit with a desired frequency.

REFERENCES:
patent: 4204206 (1980-05-01), Bakula et al.
patent: 4761735 (1988-08-01), Amy
John Uffenbeck, "Microcomputers and Microprocessors: The 8080, 8085, and Z-80 Programming, Interfacing, and Troubleshooting", printed by Prentice-Hall, Inc. Englewood Cliffs, New Jersey, ISBN 0-13-580309-8 01 (1985) pp. 410-413.

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