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Functional Description
the external battery or I/O supply) and is active irrespective of the status
of the processor core supply (V
supply are valid:
• the current time is updated every second into the RTC clock regis-
ter (
RTC_CLOCK
• interrupts can be issued periodically every second, every minute,
every hour or every day
Each of the interrupts can be independently controlled, described in
"Interrupts" on page
It is the responsibility of the program to set the correct time by a software
write into the
RTC_CLOCK
long as the RTC supply is valid.
Partitioning
The RTC is partitioned into two blocks. The counting and clock function
is provided in the I/O voltage domain (V
access function and the user interface are provided in the core voltage
domain. The RTC I/O operates on a dedicated power supply provided by
the external 3.3 V (nominal) lithium coin cell. The RTC also has the abil-
ity to switch to the I/O supply (V
nominal core voltage supply (V
blocks is provided by a set of level shifters. The partitioning at chip level is
shown in
Figure
18-6
www.BDTIC.com/ADI
DDINT
)
18-10.
register. Once set, the counters maintain time as
DDEXT
DDINT
18-2.
ADSP-214xx SHARC Processor Hardware Reference
). When the processor core and I/O
), while the control and
DDEXT
). The RTC core operates on the
). The interface between both
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