Freescale Semiconductor, Inc.
Random-Access Memory (RAM)
Before processing an interrupt, the central processor unit (CPU) uses
five bytes of the stack to save the contents of the CPU registers.
NOTE: For M6805, M146805, and M68HC05 compatibility, the H register is not
stacked.
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 could overwrite
data in the RAM during a subroutine or during the interrupt stacking
operation.
Technical Data
MC68HC908AS60 — Rev. 1.0
Random-Access Memory (RAM)
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