Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 691

Pin Descriptions
The pins used for the real-time clock are described in the ADSP-2147x
data sheet.
Clocking
The RTC timer is clocked by a 32.768 kHz crystal external to the proces-
sor. The RTC system registers are clocked by this crystal.
There is no way to disable the RTC counters from software. If a given sys-
tem does not require the RTC functionality, then it may be disabled with
hardware tie-offs. Tie the
leave the pin unconnected.
RTXO
Register Overview
This section provides basic information on the RTC control and status
registers only. Complete bit information can be found at
Clock Registers" on page
Control Register (RTC_CTL). Used to control interrupts.
Clock Register (RTC_CLOCK). Used to read or write the current time
and is updated every second.
Initialization Register (RTC_INIT). Used to enable the RTC. This regis-
ter should only be written during initialization and not during normal
operation.
Alarm Register (RTC_INIT). Used to enable the alarm functions.
Status Register (RTC_STAT). Used to report various RTC events.
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
Real-Time Clock—ADSP-2147x
pin to , tie the
RTXI EGND
A-209.
pin to , and
RTCVDD EVDD
"Real-Time
18-3