Portable electronic device equipped with timekeeping and calcula

Details Portable electronic device equipped with timekeeping and calcula Portable electronic device equipped with timekeeping and calcula

1978-07-26

1980-08-12

Smith, Jerry

Boots, shoes, and leggings

G06F 748, G06F 1502, G04B 1930

Patent

active

042176549

ABSTRACT:
A portable electronic device equipped with timekeeping and calculation functions, time and calculation data being stored in semistatic shift registers. Time data is circulated once per second through a loop containing two full adders with units of seconds being incremented by one in each circulation by the first adder and digit carry operations performed by the second adder and by a bit set/reset circuit during the same circulation. Units of seconds digit of displayed time data corresponds directly to least significant digit of stored time information.

REFERENCES:
patent: 3788058 (1974-01-01), Idei et al.
patent: 3813533 (1974-05-01), Cone et al.
patent: 3816730 (1974-06-01), Yamamoto et al.
patent: 4093992 (1978-06-01), Kawamura et al.

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