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The stack pointer is a 16-bit register that contains the address of the next location on the stack which can be used for Copy MC68HC08BD24 MCU Embedded Program. During a reset, the stack pointer is preset to $00FF. The reset stack pointer (RSP) instruction sets the least significant byte to $FF and does not affect the most significant byte.

The stack pointer decrements as data is pushed onto the stack and increments as data is pulled from the stack from RECOVER MCU.

Stack Pointer (SP)

In the stack pointer 8-bit offset and 16-bit offset addressing modes, the stack pointer can function as an index register to access data on the stack. The CPU uses the contents of the stack pointer to determine the conditional address of the operand.

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The location of the stack is arbitrary and may be relocated anywhere in RAM. Moving the SP out of page 0 ($0000 to $00FF) frees direct address (page 0) space. For correct operation, the stack pointer must point only to RAM locations.

The program counter is a 16-bit register that contains the address of the next instruction or operand to be fetched in the process of Remove Protected P89LPC938 Chip Firmware.

Normally, the program counter automatically increments to the next sequential memory location every time an instruction or operand is fetched. Jump, branch, and interrupt operations load the program counter with an address other than that of the next sequential location.

During reset, the program counter is loaded with the reset vector address located at $FFFE and $FFFF. The vector address is the address of the first instruction to be executed after exiting the reset state.

Program Counter (PC)