Portable telephone set

• US 20010051519A1
• Filed: 06/08/2001
• Published: 12/13/2001
• Est. Priority Date: 06/12/2000
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Shirai, Kouji
• Granted Patent: US 7,181,198 B2
• Time in Patent Office: Days
• US Class Current: 455/419
• CPC Class Codes: H04M 1/72406 by software upgrading or downloading
• CPC Class Codes: H04W 8/245 from a network towards a terminal

Abstract

The invention provides a portable telephone set wherein a countermeasure can be taken against a bug of software by a user without the necessity for voluntary recovery by a maker. The portable telephone set has a hardware configuration which allows a user of the portable telephone set to perform an operation of downloading a modification portion of software from the outside such as a network and rewriting the software with the same. In this instance, the rewriting is performed not for the entire memory (ROM) space of the portable telephone set, but the software is divided and disposed into different blocks of the memory (ROM) space and the rewriting is performed in a unit of a block.

Claims

1. A portable telephone set, comprising:

a read only memory in which program data are stored;

a volatile memory for backing up the program data; and

means operable when said portable telephone set is in a mode in which rewriting of said read only memory is allowed for writing part or all of the program data backed up in said volatile memory replaceably into said read only memory.

2. A portable telephone set as claimed in

claim 1

, wherein the program data stored in said read only memory are stored in a program arrangement in accordance with an arrangement of memory blocks of said read only memory and can be rewritten in a unit of a block.