NEC 78K/0 Series - Manual (Page 100)

100
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Return from Break
RETB
Return from Software Vectored Interrupt
[Instruction format] RETB
[Operation] PC
L
← (SP),
PC H
← (SP+1),
PSW ← (SP+2),
SP
← SP+3
[Operand]
None
[Flag]
Z AC CY
R R R
[Description]
• This is a return instruction from the software interrupt generated with the BRK instruction.
• The data saved in the stack returns to the PC and the PSW, and the program returns from the interrupt service
routine.
• None of interrupts are acknowledged between this instruction and the next instruction to be executed.