Renesas R8C/Tiny Series Software Manual page 95

Chapter 3 Functions
INT
[ Syntax ]
INT src
[ Operation ]
SP SP –
M(SP) (PC
SP SP –
M(SP) (PC
PC M(IntBase
[ Function ]
• This instruction generates a software interrupt specified by
number.
src
• If is 31 or smaller, the U flag is cleared to 0 and the interrupt stack pointer (ISP) is used.
src
• If is 32 or larger, the stack pointer indicated by the U flag is used.
• The interrupts generated by the INT instruction are nonmaskable interrupts.
[ Selectable 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.
[ Flag Change ]
U I O B
Flag
Change
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.
[ Description Example ]
INT #0
[ Related Instructions ]
Interrupt by INT instruction
2
+ 2) , FLG
H
2
+ 2)
ML
+ src 4)
src
S Z D C
BRK,INTO
INTerrupt
[ Instruction Code/Number of Cycles ]
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.
78
3.2 Functions
src
. represents a software interrupt
INT
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