Renesas Renasas Single-Chip Microcomputer SH7086 Instrukcja Użytkownika Pobierz pdf (Strona 96)

Chapter 3 Functions

3.2 Functions

Interrupt by INT instruction

INTerrupt

[ Related Instructions ] BRK,INTO

[ Flag Change ]

INT INT

[ Syntax ]

INT src

[ Description Example ]

INT #0

[ Operation ]

SP SP – 2

M(SP) (PC + 2)H, FLG

SP SP – 2

M(SP) (PC + 2)ML

PC M(IntBase + src 4)

src

#IMM

*1*2

*1 #IMM denotes a software interrupt number.

*2 The range of values that can be taken on is 0 < #IMM < 63.

[ Selectable src ]

*3 The flags are saved to the stack area before the INT in-

struction is executed. After the interrupt, the flags

change state as shown on the left.

UIOBSZDC

Flag

Conditions

U : The flag is cleared if the software interrupt number is 31 or smaller. The flag does not change if

the software interrupt number is 32 or larger.

I : The flag is cleared.

D : The flag is cleared.

Change

[ Instruction Code/Number of Cycles ]

Page=

183

[ Function ]

• This instruction generates a software interrupt specified by

src

represents a software interrupt

number.

• If

src

is 31 or smaller, the U flag is cleared to 0 and the interrupt stack pointer (ISP) is used.

• If

src

is 32 or larger, the stack pointer indicated by the U flag is used.

• The interrupts generated by the INT instruction are nonmaskable interrupts.

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 307 308

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