Fujitsu MB90895 Series Hardware Manual page 362

CHAPTER 12 DTP/external interrupt
Figure 12.5-2 DTP/External Interrupt Factor and Interrupt Request Generated when Interrupt Request
DTP/externalinterrupt factor
(ehen "H" level detection)
Interrupt request to
interrupt controller
G
Precautions on interrupts
• When the DTP/external interrupt is used as the external interrupt function, no return from interrupt
processing can be made with the DTP/external interrupt request flag bit set to "1" (EIRR: ER) and the
DTP/external interrupt request set to enabled (ENIR: EN = 1). Always set the DTP/external interrupt
request flag bit to "0" (EIRR: ER) at interrupt processing.
• When the level detection is set in the detection level setting register and the level that becomes the
interrupt factor remains input, the external interrupt request flag bit is reset immediately even when
cleared (EIRR: ER = 0).Disable the DTP/external interrupt request output as needed (ENIR: EN = 0), or
cancel the interrupt factor itself.
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Enabled
Terminated interrupt factor
Being inactive by clearing the DTP/external interrupt request flag bit (EIRR: ER)