Registers – Coded record sensors – Particular sensor structure
Patent
1993-01-14
1997-07-01
Bowler, Alyssa H.
Registers
Coded record sensors
Particular sensor structure
395430, 395490, 235380, 235382, G06F 926, G06F 1214, G06F 1504
Patent
active
056447817
ABSTRACT:
A microcomputer includes a ROM storing various instruction codes including an invalidation instruction code for invalidating a content of an instruction decoder. The invalidation instruction code is read from the ROM and decoded in order to produce an invalidation control signal when a predetermined security execution condition is established. Thus, the security of data contained in the instruction decoder is improved by the ability to physically invalidate an operation of the instruction decoder by writing a predetermined value into the instruction decoder or by erasing its content.
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Greenfield, Joseph, "Practical Digital Design Using ICs", 1983, pp. 158-187.
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Greenfield, Joseph, "Practical Digital Design Using IC's", 1983, pp. 158-187.
Mano, Morris, "Computer System Architecture", 1982, pp. 21-35, 69-71, 188.
Bowler Alyssa H.
Rohm & Co., Ltd.
Stachler II Robert E.
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