Renesas R8C/Tiny Series Software Manual page 148

Chapter 3 Functions
UND
[ Syntax ]
UND
[ Operation ]
SP
M(SP)
SP
M(SP)
PC
[ Function ]
• This instruction generates an undefined instruction interrupt.
• The undefined instruction interrupt is nonmaskable.
[ Flag Change ]
U I O B
Flag
Change
Conditions
U : The flag is cleared.
I : The flag is cleared.
D : The flag is cleared.
[ Description Example ]
UND
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Interrupt for undefined instruction
UNDefined instruction
SP – 2
(PC + 1) , FLG
H
SP – 2
(PC + 1)
ML
M(FFFDC )
16
S Z D C
page 130 of 263
[ Instruction Code/Number of Cycles ]
*1 The flags are saved to the stack area before the UND
instruction is executed. After the interrupt, the flag status
becomes as shown at left.
3.2 Functions
UND
Page: 241