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Microcomputer

A technology of microcomputer and area, which is applied in the direction of preventing unauthorized use of memory, coating, and liquid coating on the surface, etc., and can solve problems such as inability to read and write, and inability to access

Inactive Publication Date: 2008-01-09
TOSHIBA CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, with regard to a specific area in the memory, it cannot be accessed, read or written to when the outside has the bus right.

Method used

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no. 1 example

[0024] FIG. 1 is an outline of a microcomputer of the present invention mounted in an air conditioner. In FIG. 1, 1 is a storage device, that is, a ROM. The ROM1 is divided into a plurality of areas, such as a first area and a second area.

[0025] An initial setting program and an integrated control program are stored in the first area. The initial setting program starts when the power is turned on, and performs an initial setting that allows access to all addresses in the first area. The initial setting of the address to be allowed cannot be changed. The integrated control program is composed of data and commands stored in addresses Xa to Xy, and determines and processes the overall control operation of the device on which the microcomputer is mounted. As the command, there is a jump instruction to the address of the second area.

[0026] In addition to initial setting programs and commands, the second area stores start control programs, rotational speed control programs...

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PUM

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Abstract

The present invention provided a microcomputer which can achieve security of program stored in a storage means in the microcomputer. In the microcomputer, the storage area of ROM (Read Only Memory) 1 is divided into a first area and a second area. Access to specified addresses at at least one area between the first area and the second area of the ROM 1 is permitted, and access to remaining addresses is prohibited.

Description

technical field [0001] The present invention relates to a microcomputer having a storage device that divides a storage area into a plurality of areas. Background technique [0002] Currently, a microcomputer is used for various controllers, and operations are performed using a program (program) stored in an internal storage device such as a ROM (read only memory). The control system of such a controller is composed of a part that determines and processes the overall control operation of the installed equipment, and a drive processing (driver) section that controls various actuators of the equipment according to the determined operation content. If the actuator is a simple relay (relay) and switch (switch), the driver part can be simply configured, but in the case of driving a large-capacity DC motor (dc motor), etc., it becomes a considerable burden on the driver part. The load, and the program for driving it also has a large capacity. [0003] For example, a controller of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/14
CPCB05C5/0225
Inventor 秋山和彦神户崇幸温品治信
Owner TOSHIBA CARRIER CORP
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