公开(公告)号：JPH11232100A

公开(公告)日：1999-08-27

申请号：JP30756298

申请日：1998-10-28

Applicant: MICROCHIP TECH INC

Inventor： DRAKE RODNEY J ,  TRIECE JOSEPH W ,  WOJEWODA IGOR ,  JOHANSEN DARREL ,  YACH RANDY L ,  BOLES BRIAN

IPC: G06F9/35

Abstract: PROBLEM TO BE SOLVED: To generate an indirect addressing mode address by providing a multiplexer circuit connected to the respective output terminals of a data pointer register, an incrementer and an adder. SOLUTION: A data pointer register 12 stores the current address of an operand used in a simple indirect addressing mode. An incrementer 14 increases the current address of the operand stored in the data pointer register 12. An adder 16 adds the current address and an offset value stored in the data pointer register 12. A multiplexer circuit 18 having a first input terminal connected to the output terminal of the data pointer register 12, a second input terminal connected to the output terminal of the incrementer 14 and a third input terminal connected to the output terminal of the adder 16 selects a desired generated indirect addressing mode address and outputs the selected address to an instruction register.

公开(公告)号：DE69808020T2

公开(公告)日：2003-05-22

申请号：DE69808020

申请日：1998-10-14

Applicant: MICROCHIP TECH INC

Inventor： DRAKE RODNEY J ,  TRIECE JOSEPH W ,  YACH RANDY L ,  BOLES BRIAN ,  WOJEWODA IGOR ,  JOHANSEN DARREL

IPC: G06F9/35

Abstract: A data pointer for generating an indirect addressing mode address within a single cycle for a selected one of a plurality of multiple indirect addressing modes. The data pointer is used with a processor architecture scheme which allows for encoding of multiple addressing modes. A data pointer register is coupled to the processor architecture scheme for storing a current address of an operand to be used in a simple indirect addressing mode. An incrementer is coupled to the data pointer register for incrementing the current address of an operand to be used in a simple indirect data addressing mode by a set number thereby generating an address of an operand to be used in an indirect addressing mode with auto preincrement. An adder is coupled to the data pointer register for combining the current address of an operand to be used in a simple indirect data addressing mode with an offset number thereby generating an address of an operand to be used in an indirect addressing mode with offset. A multiplexer circuit is coupled to an output of the data pointer register, to an output of the incrementer, and to an output of the adder for selecting a desired indirect addressing mode address.

公开(公告)号：AT224558T

公开(公告)日：2002-10-15

申请号：AT98119388

申请日：1998-10-14

Applicant: MICROCHIP TECH INC

Inventor： DRAKE RODNEY J ,  TRIECE JOSEPH W ,  YACH RANDY L ,  BOLES BRIAN ,  WOJEWODA IGOR ,  JOHANSEN DARREL

IPC: G06F9/35

Abstract: A data pointer for generating an indirect addressing mode address within a single cycle for a selected one of a plurality of multiple indirect addressing modes. The data pointer is used with a processor architecture scheme which allows for encoding of multiple addressing modes. A data pointer register is coupled to the processor architecture scheme for storing a current address of an operand to be used in a simple indirect addressing mode. An incrementer is coupled to the data pointer register for incrementing the current address of an operand to be used in a simple indirect data addressing mode by a set number thereby generating an address of an operand to be used in an indirect addressing mode with auto preincrement. An adder is coupled to the data pointer register for combining the current address of an operand to be used in a simple indirect data addressing mode with an offset number thereby generating an address of an operand to be used in an indirect addressing mode with offset. A multiplexer circuit is coupled to an output of the data pointer register, to an output of the incrementer, and to an output of the adder for selecting a desired indirect addressing mode address.

公开(公告)号：AT522860T

公开(公告)日：2011-09-15

申请号：AT00915025

申请日：2000-03-23

Applicant: MICROCHIP TECH INC

Inventor： BOLES EDWARD ,  DRAKE RODNEY ,  JOHANSEN DARREL ,  MITRA SUMIT ,  TRIECE JOSEPH ,  YACH RANDY

IPC: G06F9/30 ,  G06F9/312 ,  G06F9/315 ,  G06F9/318 ,  G06F9/32 ,  G06F9/34 ,  G06F9/35 ,  G06F12/00

Abstract: A microcontroller apparatus is provided with an instruction set for manipulating the behavior of the microcontroller. The apparatus and system is provided that enables a linearized address space that makes modular emulation possible. Direct or indirect addressing is possible through register files or data memory. Special function registers, including the Program Counter (PC) and Working Register (W), are mapped in the data memory. An orthogonal (symmetrical) instruction set makes possible any operation on any register using any addressing mode. Consequently, two file registers to be used in some two operand instructions. This allows data to be moved directly between two registers without going through the W register. Thus increasing performance and decreasing program memory usage.

公开(公告)号：DE69808020D1

公开(公告)日：2002-10-24

申请号：DE69808020

申请日：1998-10-14

Applicant: MICROCHIP TECH INC

Inventor： DRAKE RODNEY J ,  TRIECE JOSEPH W ,  YACH RANDY L ,  BOLES BRIAN ,  WOJEWODA IGOR ,  JOHANSEN DARREL

IPC: G06F9/35

Abstract: A data pointer for generating an indirect addressing mode address within a single cycle for a selected one of a plurality of multiple indirect addressing modes. The data pointer is used with a processor architecture scheme which allows for encoding of multiple addressing modes. A data pointer register is coupled to the processor architecture scheme for storing a current address of an operand to be used in a simple indirect addressing mode. An incrementer is coupled to the data pointer register for incrementing the current address of an operand to be used in a simple indirect data addressing mode by a set number thereby generating an address of an operand to be used in an indirect addressing mode with auto preincrement. An adder is coupled to the data pointer register for combining the current address of an operand to be used in a simple indirect data addressing mode with an offset number thereby generating an address of an operand to be used in an indirect addressing mode with offset. A multiplexer circuit is coupled to an output of the data pointer register, to an output of the incrementer, and to an output of the adder for selecting a desired indirect addressing mode address.