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NEC PD754144 User Manual

Page 73

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CHAPTER 4 INTERNAL CPU FUNCTION

73

User’s Manual U10676EJ3V0UM

Figure 4-11. Data Saved to Stack Memory (MkII Mode)

Stack

SP – 1

SP

PUSH instruction

Stack

PC11-PC8

PC3-PC0

PC7-PC4

CALL, CALLA, CALLF instruction

Stack

Interrupt

SP – 4

SP – 3

SP – 2

SP – 5

PC11-PC8

PC3-PC0

PC7-PC4

SP – 2

SP – 1

SP

SP – 3

SP – 4

SP – 5

0

0

0

0

0

0

0

0

CY

SK2

MBE RBE

SK1 SK0

IST0

IST1

PSW

SP – 2

Register pair, low

Register pair, high

SP – 6

SP – 6

*

*

MBE RBE

*

*

*

*

Note

SP – 1

SP

Figure 4-12. Data Restored from Stack Memory (MkII Mode)

Stack

SP + 1

SP + 2

POP instruction

Stack

PC11-PC8

PC3-PC0

PC7-PC4

RET, RETS instruction

Stack

RETI instruction

SP + 2

SP + 3

SP + 4

SP + 1

PC11-PC8

PC3-PC0

PC7-PC4

SP + 4

SP + 5

SP + 6

SP + 3

SP + 2

SP + 1

0

0

0

0

0

0

0

0

CY

SK2

MBE RBE

SK1 SK0

IST0

IST1

PSW

SP

Register pair, low

Register pair, high

SP

SP

*

*

MBE RBE

*

*

*

*

Note

SP + 5

SP + 6

Note The contents of PSW other than MBE and RBE are not saved or restored.

Remark

*: Undefined

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