Evin Interrupt And Time Stamp Function; Diagram Of Evin Interrupt Function - Epson RA8804 CE Applications Manual

RA8804 CE

8.4. EVIN Interrupt and Time stamp Function

8.4.1. Diagram of EVIN interrupt function

EIE bit
/INT output
EF bit
Event
occurs
RTC internal operation
Write operation
(1) The EVIN interrupt event occurred.
(2) At the same time, EF bit values becomes "1".
(3) When the EF bit = "1", its value is retained until it is cleared to zero.
(4) If EIE = "1" when an EVIN interrupt occurs, the /INT pin output goes low.
 When an EVIN interrupt event occurs, /INT pin output goes low, and this status is then held until it is cleared
via the EF bit or EIE bit.
(5) If the EIE value is changed from "1" to "0" while /INT is low, the /INT status immediately changes from low to
Hi-Z. After the alarm interrupt occurs and before the EF bit value is cleared to zero, the /INT status can be
controlled via the EIE bit.
(6) If the EF bit value is changed from "1" to "0" while /INT is low, the /INT status immediately changes from low to
Hi-Z.
(7) If the EIE bit value is "0" when an EVIN interrupt occurs, the /INT pin status remains Hi-Z.
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(4)
(5)
(6)
(3)
(2)
(1)
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ETM60E-02