Microcomputer
AssigneeLapis Semiconductor Co., Ltd.
InventorYoshitaka Suzuki
Life of this patent
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Abstract
The present invention provides a microcomputer having a CPU, a flash ROM which stores programs or the like therein and a read controller which controls reading of the flash ROM. In the microcomputer, the flash ROM is partitioned by sectors. When a read address is designated, the flash ROM outputs read data and security information for a sector corresponding to the read address. On the other hand, the read controller includes a switch which sets whether the flash ROM is of a boot device. When the flash ROM is undesignated as the boot device and the read data is protected by the security information, the read controller stops the output of the read data.
Claims3
A microcomputer comprising:
- a central processing unit which performs processing and control in accordance with programs;
- a memory which stores data containing the programs therein;
- and
- a read controller which reads the data from the memory in accordance with the control from the central processing unit,
- wherein the memory is partitioned by sectors each having a memory area in which a continuous address space is constant, said memory outputting a memory content of an address intended for reading as read data when the address is designated and outputting security information indicative of whether a memory content of a sector to which the address belongs, is being protected, and
- wherein the read controller controls the output of the read data in accordance with set information indicative of whether the memory is designated as a device for storing a startup program, and the security information outputted from the memory.
Dependencies are inferred from the claim text.