EDWARD ALEXANDER RUPP
Pilots at Wilbur Dr, Austin, TX

4334268, Jun 8, 1982

May 1, 1979

6/035138

Joel F. Boney - Austin TX
Edward J. Rupp - Austin TX
James S. Thomas - Manor TX

Motorola, Inc. - Schaumburg IL

G06F 932

364200

A single-chip microcomputer comprises a central processor unit (100), a random access memory (110), a read only memory (120), internal timing circuitry including a timer counter (131), and three I/O data ports (140, 150, and 160). Included within the instruction set of the microcomputer are a branch on bit set instruction and a branch on bit clear instruction. The branch on bit set instruction is a three-byte instruction in which the first byte represents the op code including a designation of a particular bit to be examined, the second byte represents the address of a memory location in which the designated bit is to be examined, and the third byte represents an offset which when combined with the contents of the program counter designates a memory location to which a branch is to be taken if the designated bit is in fact set. For the branch on bit clear instruction, a branch is performed when the particular bit examined is determined not to be set. The branch on bit set and branch on bit clear instructions facilitate serial I/O operations by the microcomputer.

4584666, Apr 22, 1986

Jun 21, 1984

6/623043

John Zolnowsky - Menlo Park CA
Edward J. Rupp - Austin TX
Douglas B. MacGregor - Austin TX

Motorola, Inc. - Schaumburg IL

G06F 738

364900

A typical feature of a data processor is a bounds check. A bounds check is achieved when a determination is made as to whether a check value, typically an address or datum, is within predetermined bounds. Such check values may be signed or unsigned. By requiring that the upper bound be numerically larger than the lower bound for doing a signed check, and requiring that the upper bound be logically larger than the lower bound for doing an unsigned check, the bounds check is performed by the data processor without the need of receiving a signal which informs the data processor in advance as to whether the check is to be signed or unsigned.