Zilog Z16F2810 - Manual (Page 123)

UM018809-0611 ILL Instruction
ZNEO
®
CPU Core
User Manual
107
An IRET instruction must not be used to end an Illegal Instruction exception service rou-
tine. Because the stack contains the Program Counter value of the illegal instruction, an
IRET instruction returns code execution to this illegal instruction.
Flags
Flags are not affected by this instruction.
Syntax and Opcodes
Example
Before: PC=00FD_044EH, SP=FFFF_DB22H, 0000_0008H=0000_FE00H
ILL ;Object Code: FFFF
After: PC=0000_FE00H, SP=FFFF_DB1CH, FFFF_DB1CH=00FD_044EH,
FFFF_DB20H=00H, FFFF_DB21H=Flags[7:0]
Instruction, Operands Word 0 Word 1 Word 2
ILL FFFFH
Caution: