UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 76

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

74
The SP is decremented ahead of write (save) to the stack memory and is incremented after read (reset) from
the stack memory.
Each stack operation saves/resets data as shown in Figures 5-10 and 5-11.
Caution
SP
SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
15
Since RESET input makes the SP contents undefined, be sure to initialize the SP before using
the stack memory.
(b) CALL, CALLF, CALLT instructions (when SP is FEE0H)
SP
SP
SP
SP
SP
SP
(c) Interrupt, BRK instruction (when SP is FEE0H)
Figure 5-10. Data to Be Saved to Stack Memory
(a) PUSH rp instruction (when SP is FEE0H)
FEDEH
FEDEH
FEDDH
FEE0H
FEE0H
FEE0H
Figure 5-9. Stack Pointer Format
CHAPTER 5 CPU ARCHITECTURE
User’s Manual U14260EJ4V0UD
FEE0H
FEDFH
FEDEH
FEE0H
FEDFH
FEDEH
FEE0H
FEDFH
FEDEH
FEDDH
Register pair upper
Register pair lower
PC15 to PC8
PC15 to PC8
PC7 to PC0
PC7 to PC0
PSW
0