Z86E3016PSG Datasheet, PDF (49/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 CPU
User Manual
31
value in FEh is ignored. FEh can be used as a general-purpose register in
this case only.
An overflow or underflow can occur when the stack address is incre-
mented or decremented during normal stack operations. The programmer
must prevent this occurrence or unpredictable operation will result.
Top of Stack
PCL
PCH
Top of Stack
PCL
PCH
FLAGS
Stack Contents
After a Call
Instruction
Figure 11. Stack Operations
Stack Contents
After an
Interrupt Cycle
UM001602-0904
Address Space