Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 90)

100

101

Chapter 3 Functions

3.2 Functions

179

ENTER function

Build stack frame

[ Description Example ]

ENTER #3

[ Related Instructions ] EXITD

ENTER ENTER

[ Flag Change ]

[ Operation ]

SP SP – 2

M(SP) FB

FB SP

SP SP – src

[ Syntax ]

ENTER src

src

#IMM8

[ Selectable src ]

UIOBSZDC

[ Instruction Code/Number of Cycles ]

Page=

Flag

Change

Return address (L)

Return address (M)

Return address (H)

Argument of function

After instruction execution

Auto variable area

Direction in

which address

increases

Number of bytes

indicated by

src

FB (L)

FB (H)

Return address (L)

Return address (M)

Return address (H)

Argument of fun

ction

Before instruction execution

[ Function ]

• This instruction generates a stack frame.

src

represents the size of the stack frame.

• The diagrams below show the stack area status before and after the ENTER instruction is executed at

the beginning of a called subroutine.

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 307 308

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Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario Pagina 90

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