Method For Enlarging Data Memory In An Existing Microprocessor Architecture With Limited Memory Addressing

摘要

A method for expanding a data memory for a microprocessor architecture which uses a bank select accessing scheme for accessing data memory which is divided into a plurality of memory banks. A bank select register is configured to select a memory bank and the microprocessor architecture has an instruction set with a dedicated instruction for selecting a memory bank. An opcode of the dedicated bank select instruction provides for a maximum of n bits payload thereby providing for an address value which is configured to select a maximum of 2n memory banks. The method has the steps of: using an opcode of a test instruction that provides for m bits of payload for a new bank select instruction, wherein m>n; and using an opcode of the dedicated bank select instruction for a new test instruction.

主权项

1. A method for expanding a data memory for a microprocessor architecture comprising a bank select accessing scheme for accessing data memory which is divided into a plurality of memory banks and a bank select register configured to select a memory bank and wherein the microprocessor architecture comprises an instruction set having a dedicated instruction for selecting a memory bank; wherein an opcode of the dedicated bank select instruction provides for a maximum of n bits payload thereby providing for an address value which is configured to select a maximum of 2n memory banks, the method comprising the steps of:
using an opcode of a test instruction that provides for m bits of payload for a new bank select instruction, wherein m>n; and using an opcode of the dedicated bank select instruction for a new test instruction.