UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 574

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) When VCIE bit is 1
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In this mode, an interrupt is not generated after macro service ends. Figure 20-19 shows an example of macro service
and interrupt acknowledgment operations when the VCIE bit is 1.
This mode is used when the final operation is to be started by the last macro service processing performed, for instance.
It is mainly used in the following cases:
• Clocked serial interface receive data transfers (INTCSI/INTCSI1/INTCSI2)
• Asynchronous serial interface data transfers (INTST/INTST2)
• To stop a stepping motor in the case (INTC10/INTC11) of stepping motor control by means of macro service type
C using the real-time output port and timer/counter.
Interrupt Request Due to he End of
the Hardware Operation Started by
the Last Macro Service Processing
Last Macro Service Request
Figure 20-19 Operation at End of Macro Service When VCIE = 1
Macro Service Request
CHAPTER 20 INTERRUPT FUNCTIONS
Main Routine
EI
Macro Service Processing
Processing of Last Macro Service
Interrupt Processing