Manipulating the Stack of the PIC18 Microcontroller
■Traditionally, the microcontroller stack has only been used as a storage space for return addresses of sub routines or interrupt routines, where all 'push' and 'pop' operations were hidden. For the most part, users had no direct access to the information on the stack. The PIC18 microcontroller diverges from this tradition slightly. With the new PIC18 core, users now have access to the stack and can modify the stack pointer and stack data directly. Having such levels of access to the stack allows for some unique and interesting programming possibilities.
■This application note describes specific information, registers, and instructions related to accessing the stack. An example is also included demonstrating a very simple task manager, an essential element for a real-time operating system (RTOS).
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