Low power timekeeping system

Details Low power timekeeping system Low power timekeeping system

1988-06-17

1991-09-17

Teska, Kevin J.

Boots, shoes, and leggings

364200, 364900, 368 10, G06F 1520, G06F 1300

Patent

active

050501135

ABSTRACT:
A low power timekeeping system utilizes a state machine to first read seconds stored in a RAM and update seconds and then determine if the minutes requires updating. If the minutes do not require updating then the sequencer stops operation until the next update cycle. Similarly, the minutes, hours, days of the week, date of the month, month, and year are updated only as needed in each update cycle thereby lowering the power requirement needed by the timekeeping system.

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Microprocessors-Hardware & Applications, 1984, Appendix J-Z80CPU, Z80A-CPU, Section 2.1, pp. 851-853.
Heathkit Continuing Education Individual Learning Program-Microprocessors, unit 9, pp. 9-143 through 9-147, 1977.

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