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UPD78323LP Datasheet(PDF) 41 Page - NEC |
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UPD78323LP Datasheet(HTML) 41 Page - NEC |
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41 / 86 page  41 µPD78323, 78324 4. INTERRUPT FUNCTIONS 4.1 OVERVIEW In the µPD78324, various interrupt requests generated externally or from the on-chip peripheral hardware are handled in the following three processing modes. Interrupt requests are classified into the following three groups. • Nonmaskable interrupt requests • Maskable interrupt requests • Interrupt requests by software Figure 4-1 shows the maskable interrupt request processing modes. Table 4-1 gives a listing of interrupt factors which can be processed. Figure 4-1. Interrupt Request Processing Modes Handled by Vectored Interrupt Processing Interrupt Request Handled by Context Switching Handled by Macro Service × × MK = 1 (Interrupt Masked) Vectored Interrupt and Macro Service Reserved × × MK = 0 (Interrupt Unmasked) × × ISM = 0 (Vectored Interrupt Processing Mode) DI Vectored Interrupt Processing Reserved EI × × CSE = 0 Vectored Interrupt Processing Executed × × CSE = 1 Context Switching Executed × × ISM = 1 (Macro Service Processing Mode) Macro Service Processing Executed |
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