IC card

Details IC card IC card

1988-11-28

1991-05-28

Shaw, Gareth D.

Boots, shoes, and leggings

3642328, 3642329, 3642384, 3642430, 3642450, 3642463, G06F 1200, G06F 900

Patent

active

050199706

ABSTRACT:
An IC card includes an addressable CPU having a memory space including a special area including a first plurality of memory addresses which are addressable with a short instruction word, first and second memories in which test and application programs are stored, respectively, a bus which connects the CPU and the first and second memories, a first selection circuit for forming a first memory mapping arrangement in which at least a portion of the first memory is superimposed on the special area, a second selection circuit for forming a second memory mapping arrangement in which at least a portion of the second memory is superimposed on the special area, a detection circuit for detecting the execution of the test program or the application program, and a changeover circuit arranged to selectively operate the first and second selection circuits according to the result of detection executed by the detection circuit. The above-described arrangement makes it possible to effectively use the special area to efficiently execute either the application program or the test program.

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patent: 4709137 (1987-11-01), Yoshida
patent: 4748320 (1988-05-01), Yorimoto et al.
patent: 4755660 (1988-07-01), Nakano
patent: 4777355 (1988-10-01), Takahira
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patent: 4816656 (1989-03-01), Nakano et al.
patent: 4829169 (1989-05-01), Watanabe
patent: 4839506 (1989-06-01), Homma et al.
patent: 4930129 (1990-05-01), Takahira
patent: 4949298 (1990-08-01), Nakanishi et al.
patent: 4960982 (1990-10-01), Takahira
patent: 4965802 (1990-10-01), Shinagawa
Manual of Single-Chip 8-Bit CMOS Microcomputer, Mitsubishi Electric pp.2-140.

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