UPD78F0138 NEC, UPD78F0138 Datasheet - Page 89

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

3.4.9 Stack addressing
[Function]
[Description example]
[Illustration]
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.
In the case of PUSH DE (saving DE register)
SP
SP
Operation code
FEDEH
FEE0H
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16228EJ2V0UD
1
0
FEDEH
FEDFH
FEE0H
1
1
7
0
1
Memory
0
D
E
1
0
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