NEC PD754144 - Manual (Page 205)

CHAPTER 7 INTERRUPT AND TEST FUNCTIONS
205 User’s Manual U10676EJ3V0UM
(1) Enabling or disabling interrupt
Reset
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<1>
EI IE0
EI IET1 <2>
EI
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<3>
DI IE0
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<4>
DI
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<5>
Disables
interrupts
Enables INT0 and INTT1
Enables INTT1
Disables
interrupts
<1> All the interrupts are disabled by the RESET signal.
<2> An interrupt enable flag is set by the EI IE
××× instruction. At this stage, the interrupts are still disabled.
<3> The interrupt master enable flag is set by the EI instruction. INT0 and INTT1 are enabled at this time.
<4> The interrupt enable flag is cleared by the DI IE ××× instruction, and INT0 is disabled.
<5> All the interrupts are disabled by the DI instruction.