UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 70

• Manufacturer Part Number: UPD72042BGT
• Description: LSI DEVICE FOR Inter Equipment Bus (IEBus) PROTOCOL CONTROL
• Manufacturer: NEC [NEC]

70
6.3 INTERRUPT ROUTINE
registers) of the PD72042B, and sets the communication flags to be used by the main routine.
disabled, do not clear the interrupt flags such that such a request can be detected upon the completion of the interrupt
routine processing (see Fig. 6-2).
Microcompute
routine
The interrupt routine performs the required processing when an interrupt request is issued from the PD72042B.
The interrupt routine disables the interrupts received from the PD72042B, reads the statuses (FLG and RCR
To enable the handling of an interrupt request which may occur while the interrupts from the PD72042B are
RCR
IRQ
Fig. 6-2 Operation when an Interrupt Occurs during Execution of Interrupt Routine
(interrupts enabled)
Main routine
Data Sheet S13990EJ3V0DS
(interrupts disabled)
Interrupt routine
(interrupts disabled)
Interrupt routine
PD72042B