Epson RX8804CE Applications Manual page 33

RX8804CE
When a "1" is written to the TE bit, the wakeup timer countdown starts from the preset value.
A wakeup timer interrupt event starts a countdown based on the countdown period (source clock). When the count value
changes from 01h to 00h, an interrupt event occurs.
 After the interrupt event occurs, the counter automatically reloads the preset value and again starts to count down.
(Repeated operation)
When a wakeup timer interrupt event occurs, "1" is written to the TF bit.
(3)
When the TF bit = "1" its value is retained until it is cleared to zero.
(4)
(5) If the TIE bit = 1 when a wakeup timer interrupt occurs, /INT pin output goes low.
 If the TIE bit = "0" when a wakeup timer interrupt occurs, /INT pin output remains Hi-Z.
Output from the /INT pin remains low during the tRTN period following each event, after which it is automatically
(6)
cleared to Hi-Z status.
 /INT is again set low when the next interrupt event occurs.
(7) When a 0 is written to the TE bit, the wakeup timer function is stopped and the /INT pin is set to Hi-Z status.
 When /INT = low, the wakeup timer function is stopped. The tRTN period is the maximum amount of time before the /INT
pin status changes from low to Hi-Z.
As long as /INT = low, the /INT pin status does not change when the TF bit value changes from "1" to "0".
(8)
When /INT = low, the /INT pin status changes from low to Hi-Z as soon as the TIE bit value changes from "1" to
(9)
"0".
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