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D17133CS Datasheet(PDF) 263 Page - NEC |
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D17133CS Datasheet(HTML) 263 Page - NEC |
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263 / 289 page  CHAPTER 18 INSTRUCTION SET 248 2. The interrupt accepted in this example (an interrupt request is generated after the EI instruction has been executed and the execution flow shifts to an interrupt service routine) is the interrupt, whose interrupt enable flag (IP ×××) is set. The interrupt request generation without the interrupt enable flag set does not change the program flow, after the EI instruction has been executed (therefore, the interrupt is not accepted). However, interrupt request flag (IRQ ×××) is set, and the interrupt is accepted, as soon as the interrupt enable flag is set. Example 2 An example of an interrupt, which occurs in response to an interrupt request being accepted when program counter PC is being executed: Generating interrupt request BR ABC EI MOV ADD 0AH, 0BH, #00H #01H EI RET Interrupt service routine (vecter address) ABC: (2) DI Disable interrupt <1> OP code 00111 001 1111 0000 <2> Function INTEF ← 0 Instruction to disable a vectored interrupt. <3> Example Refer to Example 1 in (1) EI. |
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