Reprogramming methods and apparatus

Details Reprogramming methods and apparatus Reprogramming methods and apparatus

1993-07-20

1995-07-04

Kriess, Kevin A.

Boots, shoes, and leggings

364DIG1, 3642304, 364284, 3642843, 3642844, 364285, 3642854, 395200, G06F 1300

Patent

active

054308771

ABSTRACT:
Two mobile communications handset terminals for a cellular telephone system each incorporate a microprocessor for controlling the operating components of the terminal. Each microprocessor operates under control of software stored in a FLASH Eprom. When the two units are interconnected by a special cable loom, a 12 volt supply of one of the units is applied to the FLASH Eprom of that unit, switching it into a reprogramming mode. This 12 volt supply is also applied via an output terminal to the FLASH Eprom of the other unit which is thus likewise switched into a reprogramming mode. Via the cable loom, each handset compares the grade of the software stored in its FLASH Eprom with the grade of software stored in the other's FLASH Eprom. The handset storing the higher grade software then assumes a MASTER mode and the other one assumes a SLAVE mode. The lower grade software in the SLAVE handset is erased from its FLASH Eprom and replaced with the higher grade software from the MASTER hand set. In this way, once a handset has been re-programmed with the latest update of software, it can itself be used to reprogram other handsets.

REFERENCES:
patent: 4525865 (1985-06-01), Mears
patent: 5155847 (1992-10-01), Kirovac et al.
Article: Microprocessors and Microsystems, vol. 14, No. 8, Oct. 1990, pp. 543-547, Zales et al.

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