MC68HC08BD24 Datasheet, PDF (50/244 Pages) Motorola, Inc – HCMOS Microcontroller Unit

During a subroutine call, the CPU uses two bytes of the stack to store
the return address. The stack pointer decrements during pushes and
increments during pulls.
NOTE:
Be careful when using nested subroutines. The CPU may overwrite data
in the RAM during a subroutine or during the interrupt stacking
operation.
Technical Data
50
MC68HC08BD24 — Rev. 1.1
Freescale Semiconductor