Microprocessor having register bank and using a general purpose

Details Microprocessor having register bank and using a general purpose Microprocessor having register bank and using a general purpose

1993-05-28

1996-02-13

Harvey, Jack B.

Boots, shoes, and leggings

364DIG1, G06F 1300

Patent

active

054918260

ABSTRACT:
A microprocessor having a register file has an execution unit, a register file for storing data or information for a task, and a bank ram. The register file includes a stack pointer, a general purpose register group having a plurality of registers for storing data used for the execution unit, and a special purpose register group for storing data of a task. The special purpose register group includes a current bank pointer, a processor status word (PSW), a preceding bank pointer, and a program counter. The bank ram is made up of a plurality of bank blocks. Each bank block consists of a predetermined unit banks. Each bank block is capable of storing the data of the register file per task. In the microprocessor described above, when a current task is switched to another task, the content of the stack pointer of the current task is set as one of the registers in the general purpose register group. The number of the unit blocks per bank block and the bit width of the stack pointer can be changed by the PSW.

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