uC1009

Conceptual

21

uC1009-DS-C3100, Nov. 2012

www.upi-semi.com

Related registers for time update interrupt functions

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” indicates write-protected bits. A zero is always read from these bits.

* Before entering settings for operations, we recommend writing a “0” to the UIE bit to prevent hardware interrupts

from occurring inadvertently while entering settings.

* When the RESET bit value is “1” time update interrupt events do not occur.

* Although the time update interrupt function cannot be fully stopped, if “0” is written to the UIE bit, the time update

interrupt function can be prevented from changing the /INT pin status to low.

1) USEL (Update Interrupt Select) bit

This bit is used to select “second” update or “minute” update as the timing for generation of time update interrupt events.

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2) UF (Update Flag) bit

Once it has been set to “0”, this flag bit value changes from “0” to “1” when a time update interrupt event occurs.

When this flag bit = “1” its value is retained until a “0” is written to it.

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Functional Description