UPD75518 NEC, UPD75518 Datasheet - Page 34

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

34
SP – 2
SP – 1
SP
SP
SP + 1
SP + 2
Note A PSW other than the MBE or RBE is not saved/restored.
Remark Data marked with * is undefined.
Lower bits of pair register
Upper bits of pair register
Lower bits of pair register
Upper bits of pair register
PUSH instruction
POP instruction
Stack
Stack
Fig. 3-9 Data Restored from Stack Memory
Fig. 3-8 Data Saved to Stack Memory
SP – 6
SP – 5
SP – 4
SP – 3
SP – 2
SP – 1
SP
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
CALL, CALLA, or CALLF instruction
RET or RETS instruction
0
*
*
0
*
*
PC11 - PC8
PC14 PC13 PC12
PC14 PC13 PC12
PC11 - PC8
PC3 - PC0
PC7 - PC4
PC3 - PC0
PC7 - PC4
*
*
*
*
Stack
Stack
MBE RBE
MBE RBE
*
*
*
*
Note
Note
SP – 6
SP – 5
SP – 4
SP – 3
SP – 2
SP – 1
SP
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
IST1
IST1
CY
CY
0
0
RETI instruction
PC14 PC13 PC12
PC11 - PC8
PC14 PC13 PC12
IST0
PC11 - PC8
PC3 - PC0
PC7 - PC4
SK2
IST0
PC3 - PC0
PC7 - PC4
SK2
Interrupt
Stack
PSW
Stack
PSW
MBE
SK1
MBE
SK1
PD75518(A)
RBE
SK0
RBE
SK0