Enhanced program counter stack for multi-tasking central...

Details Enhanced program counter stack for multi-tasking central... Enhanced program counter stack for multi-tasking central...

G - Physics

06

F

G06F 9/46 (2006.01) G06F 9/44 (2006.01)

Patent

CA 2233435

A central processing unit having at least one memory for storing instructions and data includes a program counter for storing program counter values. An execution unit retrieves and processes instructions located in the memory at addresses corresponding to the contents of the program counter. Multiple stacks independent of the memory are provided for storing program counter values. A multiplexer connects the program counter to each stack. A stack select register connected to a control input of the multiplexer enables the transfer of program counter values between the program counter and one of the stacks indicated by the contents of the stack select register. The central processing unit provides an efficient multi-tasking capability since the program counter state of each task can be stored in one of the multiple stacks.

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