NEC UPD789026 Series User Manual page 162

××IF
: Interrupt request flag
××MK : Interrupt mask flag
IE : Flag to control maskable interrupt request acceptance (1 = enable, 0 = disable)
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162
CHAPTER 10 INTERRUPT FUNCTIONS
Figure 10-11. Interrupt Request Acceptance Program Algorithm
Start
No
××IF = 1 ?
Yes (Interrupt request generated)
××MK = 0 ?
Yes
IE = 1 ?
Yes
Vectored Interrupt
Processing
User's Manual U11919EJ3V0UM00
No
Interrupt Request Pending
No
Interrupt Request Pending