8-bit micro-controller with a RISC architecture

摘要

Microcontroller [summary] 8-bit RISC-based (Figure 1), (57) 8-bit register file having a (ALU2) arithmetic logic unit in addition general-purpose 8-bit only arithmetic logic unit (ALU) (22) ( I containing 20). In addition, the register file includes (6) means for combining a pair of registers to provide a logical 16-bit registers for indirect addressing. Alleviate the computation process to be adding arithmetic functions predetermined register pair, thereby imposed on the 8-bit ALU generic because otherwise dedicated ALU is 16 bits ALU. A further feature of the invention is the inclusion of (RAMPx, y, z) paging registers to provide a large address range is further combined with (14 '') the contents of the logical 16-bit register. 8-bit micro-controller of the present invention further means for performing reading and writing directly to any bit position in the register file in a single instruction other features, is (134). This eliminates the need to perform various masking operation load, and / or shifts as was required by the micro controller in the prior art are avoided.