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CHAPTER 3 REGISTER DESCRIPTIONS
■ Note on PS Register
Because of prior processing of the PS register by some commands, a break may be brought in an interrupt
processing subroutine during the use of a debugger or flag display content in the PS register may be
changed with the following exceptional operations. In both cases, right re-processing is designed to
execute after returning from the EIT. So, operations before and after EIT are performed conforming to the
specifications.
● When a) a user interrupt or NMI is executed, b) step execution is implemented, or c) a break occurs in a
data event or emulator menu due to a command just before DIV0U/DIV0S commands, the following
operation may be implemented.
(1) D0 and D1 flags are changed first.
(2) EIT process routine (user interrupt, NMI or emulator) is executed.
(3) Returning from EIT, DIV0U/DIV0S commands are executed and D0 and D1 flags are set to the same
value in "(1)".
● When a user interrupt or NMI factor exists, and a command such as ORCCR/STILM/
MOV Ri,PS is executed to allow an interruption, the following operation is executed:
(1) PS register is changed first.
(2) EIT process routine (user interrupt, NMI) is executed.
(3) Returning from EIT, any above command is executed and PS register is set to the same value in "(1)".