NEC 78K0 Series User Manual page 88

3.4.9 Stack addressing
[Function]
The stack area is indirectly addressed with the stack pointer (SP) contents.
This addressing method is automatically employed when the PUSH, POP, subroutine call and return
instructions are executed or the register is saved/reset upon generation of an interrupt request.
With stack addressing, only the internal high-speed RAM area can be accessed.
[Description example]
PUSH DE; when saving DE register
[Illustration]
SP
SP
88
CHAPTER 3 CPU ARCHITECTURE
Operation code 1 0
FEE0H FEE0H
FEDFH
FEDEH
FEDEH
Preliminary User's Manual U17260EJ3V1UD
1 1 0 1 0 1
7 Memory 0
D
E