UPD78320 Datasheet, PDF (42/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
4. INTERRUPT FUNCTIONS
4.1 OVERVIEW
In the µPD78322, various interrupt requests generated externally or from the on-chip peripheral hardware are handled
in the following three servicing modes.
Interrupt Request
Handled by Vectored Interrupt Servicing
Handled by Context Switching
Handled by Macro Service
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 servicing modes. Table 4-1 gives a listing of interrupt factors which can
be serviced.
Figure 4-1. Interrupt Request Servicing Modes
× × MK = 1 (Interrupt Masked)
Vectored Interrupt and Macro Service Reserved
× × MK = 0 (Interrupt Unmasked)
× × ISM = 0 (Vectored Interrupt Servicing Mode)
DI
Vectored Interrupt Servicing Reserved
EI
× × CSE = 0 Vectored Interrupt Servicing Executed
× × CSE = 1 Context Switching Executed
× × ISM = 1 (Macro Service Processing Mode)
Macro Service Processing Executed
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