MC68HC908AB32 Datasheet, PDF (58/392 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Random-Access Memory (RAM)
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
58
Random-Access Memory (RAM)
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor