초록 ▼

A microprocessor on-board RAM provides both the usual random access by addressing and a subset of memory cells with their contents continually available on a secondary bus paralleling the data bus. This secondary bus may be used for register indirect addressing without a separate register read when

A microprocessor on-board RAM provides both the usual random access by addressing and a subset of memory cells with their contents continually available on a secondary bus paralleling the data bus. This secondary bus may be used for register indirect addressing without a separate register read when the RAM subset includes the registers for register indirect addressing. The processor also has a two stage output driver for limiting maximum output current and feedback-controlled clock period partitioning.

대표청구항 ▼

[ What is claimed is:] [1.] A micro controller capable of indirect addressing comprising:a data bus;a memory having at least one register;a bank select circuit coupled to said memory so as to directly couple a given one of said at least one registers to said data bus such that the contents are direc

[ What is claimed is:] [1.] A micro controller capable of indirect addressing comprising:a data bus;a memory having at least one register;a bank select circuit coupled to said memory so as to directly couple a given one of said at least one registers to said data bus such that the contents are directly placed on said bus;wherein the contents of a selected register is provided directly to said data bus, as an address for the completion of an instruction and wherein from the data bus to the selected one of said at least one register, is a read only path to the data bus from the register and wherein said selected at least one register has a fixed address and further wherein the contents of said at least one register directly provides the address for a byte of data which is the address for an instruction to be executed by said micro controller, such that the providing of the address occurs such that the full instruction can be completed within one clock cycle of said micro controller.