Eight-bit microcontroller having a risc architecture

Details Eight-bit microcontroller having a risc architecture Eight-bit microcontroller having a risc architecture

1997-03-27

1998-09-15

Harrell, Robert B.

G06F 1500

Patent

active

058093273

ABSTRACT:
An eight-bit RISC based microcontroller includes an eight-bit register file having a dedicated arithmetic logic unit (ALU), in addition to a general purpose eight-bit ALU. The register file further includes means for combining a pair of registers to provide a logical sixteen-bit register for indirect addressing. The dedicated ALU is a sixteen-bit ALU which provides certain arithmetic functions for the register pair, thus alleviating the computational burdens that would otherwise be imposed on the general purpose eight-bit ALU. A further feature of the invention is the inclusion of a paging register which is combined with the contents of the logical sixteen-bit register to provide an even greater addressing range. Yet another feature of the eight-bit microcontroller of the present invention is the means for directly reading and writing to any bit position within the register file with a single instruction. This avoids having to perform various load, shift and/or masking operations needed by prior art microcontrollers.

REFERENCES:
patent: 5301340 (1994-04-01), Cook
patent: 5333284 (1994-07-01), Nugent
patent: 5450610 (1995-09-01), Watanabe et al.
Hitachi H8/310 Microcontroller Architectural Overview, Sep. 1989.
Intel MCS.RTM. 51 Microcontroller Overview (no publication date).
Intel 8XC151SA/SB High-Performance CHMOS Microcontroller Product Preview, Mar. 1996.
Microchip Technology PIC16C5X Data Sheet, 1995.
Texas Instruments TMS370Cx1x 8-Bit Microcontroller Product Description, Mar. 1996.

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