Fujitsu F2MC-16LX Hardware Manual page 444

CHAPTER 18 DTP/EXTERNAL INTERRUPT
Figure 18.4-2 Interrupt Factor when Enabling the Interrupt and the Interrupt Request for the Interrupt
Interrupt factor
(e.g. "H" level detection)
Interrupt request
to interrupt controller
Note:
Returning from the clock mode is impossible at the edge detection.
428
Controller
Cancel of interrupt request
Inactive by clearing interrupt
request fiag bit (EIRR: ER)