Method for accessing microprocessor and microinstruction control

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3649466, 3649256, 3649332, 3649337, 364DIG1, 364DIG2, 395800, G06F 926

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active

051174871

ABSTRACT:
In a microprocessor, a microinstruction is used to control the microprocessor. The microprocessor includes: a decoder for decoding the STC instruction to obtain a decoded instruction and address data, the address data designating an address of a control space allocated to a plurality of registers in a general-purpose register group; an address register for temporarily storing the address data derived from the decoder; a microinstruction storage unit for previously storing a plurality of microinstructions and for outputting the microinstruction one by one in response to the decoded instruction; a microinstruction register for producing a control signal in response to the read microinstruction; a calculation unit for calculating the address data sotred in the address register means to obtain bit information of the address data for designating a specific register in response to the bit information derived from the calculation unit, while the general-purpose register group; and, a pointer register for temporarily storing the bit information to access the specific register in response to the bit information derived from the calculation unit, while the general-purpose register group is instructed in response to the control signal.

REFERENCES:
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patent: 4409654 (1983-10-01), Wada et al.
patent: 4434461 (1984-02-01), Puhl
patent: 4586130 (1986-04-01), Butts, Jr. et al.
patent: 4878174 (1989-10-01), Watkins et al.

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