Asynchronous serial communications on a portable communication d

Details Asynchronous serial communications on a portable communication d Asynchronous serial communications on a portable communication d

1997-02-12

1999-09-14

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455569, H04Q 732

Patent

active

059536748

ABSTRACT:
A portable communications device and accessory system which provides full-duplex asynchronous communications between a portable communication device and external accessories over a synchronous digital interface. The system includes a digital signal processor for generating a first synchronous digital voice signal, a UART for generating a first asynchronous data signal, and a microprocessor for generating a synchronous control command signal. The system further includes a first multiplexer for multiplexing the first synchronous digital voice signal and the first asynchronous data signal and the synchronous control command signal onto an interface line. The interface line couples the communication device to the at least one external accessory. A second multiplexer is coupled to the interface line, for routing the first synchronous digital voice signal and the synchronous control command signal to the at least one synchronous internal device, and for routing the first asynchronous data signal to the asynchronous internal device.

REFERENCES:
patent: 5007050 (1991-04-01), Kasparian et al.
patent: 5471643 (1995-11-01), Marui
patent: 5483530 (1996-01-01), Davis et al.
patent: 5495246 (1996-02-01), Nichols et al.
patent: 5602900 (1997-02-01), Hattori
patent: 5727233 (1997-05-01), Lynch et al.

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