NEC mPD784225 Series User Manual page 399

Figure 22-19. Operation at End of Macro Service When VCIE = 0
Main routine
Macro service request
Last macro service request
Main routine
Other interrupt request
CHAPTER 22 INTERRUPT FUNCTIONS
EI
Macro service processing
Macro service processing
Servicing of interrupt request
due to end of macro service
Servicing of other interrupt
EI
Last macro
service request
Servicing of interrupt request
due to end of macro service
User's Manual U12697EJ3V0UM
At the end of macro service
(MSC = 0), an interrupt
request is generated and
acknowledged.
Macro service processing
If the last macro service is
performed when the
interrupt due to the end of
macro service cannot be
acknowledged while other
interrupt servicing is being
executed, etc., that interrupt
is held pending until it can
be acknowledged.
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