Power-up clear in an electronic digital calculator

Details Power-up clear in an electronic digital calculator Power-up clear in an electronic digital calculator

1974-11-26

1976-01-06

Atkinson, Charles E.

Registers

Transfer mechanism

Traveling pawl

3401725, G06F 1502

Patent

active

039315070

ABSTRACT:
A greatly simplified calculator circuit implemented, for example, utilizing I.sup.2 L technology, is fabricated on a relatively small semiconductor chip resulting in high yield. A unique feature of such calculator which provides power-up clear to reset the calculator to a "zero" idle state when the calculator power is initially turned on is smaller and more reliable than the conventional open loop power-up clear circuits which rely entirely on an RC time constant thereby permitting fabrication on the smaller chip. The power-up clear circuit is a latch which forces the input of the program counter shift register to an initial logical state. The latch is reset by the logical NAND of the program counter outputs.

REFERENCES:
patent: 3470538 (1969-09-01), Harbaugh
patent: 3863060 (1975-01-01), Rode et al.

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