Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-09-23
1993-06-29
O'Shea, Sandra L.
Communications: electrical
Continuously variable indicating
With meter reading
34082562, 455 381, H04Q 100
Patent
active
052238326
ABSTRACT:
A serial data transmission circuit for performing a data transmission in a serial form includes a data shift signal input terminal, a data latch signal input terminal, and an output selector, the output of which is connected to a serial data output terminal. A shift register is connected at its serial input to a serial data input terminal and at a part of its parallel outputs to the input of the selector. A barrel shifter is provided, connected at its input to the parallel outputs of the shift register. The circuit further includes a first data latch, the input of which is connected to the output of the barrel shifter, and a second data latch, the output of which is connected to the parallel inputs of the shift register. The output of the first data latch is connected to the input of the second data latch through an internal data bus. The serial data transmission circuit can output the serial data inputted in the state as inputted, in synchronization with the data shift signal, without an internal data transfer being effected by the selection of an appropriate parallel output from the shift register through the output selector and also by masking of the data latch signal.
REFERENCES:
patent: 4399437 (1983-08-01), Falck et al.
patent: 4514731 (1985-04-01), Falck et al.
patent: 4614944 (1986-09-01), Schwan
patent: 4694293 (1987-09-01), Sugiyama et al.
IBM Technical Disclosure, "Message Check Character for Serial Transmission System", by D. H. Rumble, vol. 3 No. 9 Feb. 1961 pp. 14-16.
NEC Corporation
O'Shea Sandra L.
Zimmerman Brian
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