Zilog Z16F2810 User Manual
Page 127
UM018809-0611
IRET Instruction
ZNEO
®
CPU Core
User Manual
111
If IRET chains to another interrupt service routine, it clears the IRQE flag and leaves all other
flags unchanged.
Syntax and Opcodes
Example
Before:
PC=0035_292EH, SP=FFFF_DB1CH, FFFF_DB21H=Pre-interrupt Flags,
FFFF_DB20H=00H, FFFF_DB1CH=0000_0454H
IRET
;Object Code: FFFD
After:
PC=0000_0454H, Flags=Pre-interrupt state, SP=FFFF_DB22H
Instruction, Operands
Word 0
Word 1
Word 2
IRET
FFFDH