Microcontroller mode selection system and method upon reset

Details Microcontroller mode selection system and method upon reset Microcontroller mode selection system and method upon reset

1997-08-25

2000-06-13

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Digital data processing system initialization or configuration

Loading initialization program

713 1, 713100, G06F 1134

Patent

active

06076161&

ABSTRACT:
A system and method for selecting a post-reset operating mode for a microcontroller. The system of this invention includes a mode indicating means to communicate to the microcontroller the desired post-reset operating mode. These means may include pin(s), and/or bit flags in main memory or register. A mode selection logic circuit receives the mode detector information. If the program code corresponding to the desired operating mode has a starting address in main memory different from the default starting address of the first fetch instruction to the CPU, then the mode selection logic disables the program memory to prevent the first instruction fetch by the CPU, and instead, inserts a surrogate branch instruction onto the data bus causing the CPU to BRANCH to the starting address of the program code corresponding to the desired post-reset operating mode. Re-enabling the program memory after insertion of the surrogate branch instruction permits the CPU to execute the appropriate program code to put the microcontroller in that desired operating mode.

REFERENCES:
patent: 5339426 (1994-08-01), Aoshima
patent: 5465357 (1995-11-01), Bealkowski et al.
patent: 5732268 (1998-03-01), Bizzarri

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