NEC PD750008 - Manual (Page 81)

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CHAPTER 4 INTERNAL CPU FUNCTIONS
Figure 4-15. Data Restored from the Stack Memory (Mk II Mode)
Notes 1. PC12 and PC13 are 0 in the µPD750004. PC13 is 0 in the µPD750006 and µPD750008.
2. PSW bits other than MBE and RBE are not saved or restored.
Remark * indicates an undefined bit.
Lower bits of pair register
Upper bits of pair register
Stack
POP instruction
SP
SP + 1
SP + 2
PC11 - PC8
PC3 - PC0
PC7 - PC4
Stack
RET or RETS instruction
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
*
*
*
*
MBE
*
RBE
*
0 0
PC11 - PC8
PC3 - PC0
PC7 - PC4
Stack
RETI instruction
IST1
CY
IST0
SK2
MBE
SK1
RBE
SK0
PSW
0 0
Note 2
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
PC12 PC12 PC13
Note 1
PC13
Note 1 Note 1 Note 1