PD72042B_15 Datasheet, PDF (72/92 Pages) Renesas Technology Corp – LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL

µPD72042B
6.3 INTERRUPT ROUTINE
The interrupt routine performs the required processing when an interrupt request is issued from the µPD72042B.
The interrupt routine disables the interrupts received from the µPD72042B, reads the statuses (FLG and RCR
registers) of the µPD72042B, and sets the communication flags to be used by the main routine.
To enable the handling of an interrupt request which may occur while the interrupts from the µPD72042B are
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).
Fig. 6-2 Operation when an Interrupt Occurs during Execution of Interrupt Routine
Microcompute
routine
Main routine
(interrupts enabled)
Interrupt routine
(interrupts disabled)
Interrupt routine
(interrupts disabled)
IRQ
RCR
70
Data Sheet S13990EJ3V0DS