UPD78323 NEC, UPD78323 Datasheet - Page 41

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

4. INTERRUPT FUNCTIONS
4.1
in the following three processing modes.
can be processed.
In the PD78324, various interrupt requests generated externally or from the on-chip peripheral hardware are handled
Interrupt requests are classified into the following three groups.
Figure 4-1 shows the maskable interrupt request processing modes. Table 4-1 gives a listing of interrupt factors which
OVERVIEW
• Nonmaskable interrupt requests
• Maskable interrupt requests
• Interrupt requests by software
Interrupt Request
Vectored Interrupt and Macro Service Reserved
MK = 1 (Interrupt Masked)
MK = 0 (Interrupt Unmasked)
Figure 4-1. Interrupt Request Processing Modes
Macro Service Processing Executed
ISM = 0 (Vectored Interrupt Processing Mode)
ISM = 1 (Macro Service Processing Mode)
DI
EI
Vectored Interrupt Processing Reserved
CSE = 0
CSE = 1
Vectored Interrupt Processing Executed
Context Switching Executed
Handled by Vectored Interrupt Processing
Handled by Context Switching
Handled by Macro Service
PD78323, 78324
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