Rtc Interface; Leds And Push Buttons - Analog Devices ADSP-BF518F EZ-Board Manual

RTC Interface

RTC Interface
The ADSP-BF518F processor has a real-time clock (RTC) and a watchdog
timer. Typically, the RTC interface is used to implement a real-time
watchdog or a life counter of the time elapsed since the last system reset.
The EZ-Board is equipped with a Panasonic CR1632 lithium coin and 3V
battery supplying 125 mAh. The 3V battery and 3.3V supply of the board
connect to the
powered, the RTC circuit uses the board power to supply voltage to the
pin. When the EZ-Board is not powered, the RTC circuit uses the
RTC
lithium battery to maintain power to the
mylar, the battery lasts for about one year with the EZ-Board unpowered.
Example programs are included in the EZ-Board installation directory to
demonstrate the RTC features.

The EZ-Board is shipped with a protective Mylar sheet placed
between the coin battery and positive pin of the battery holder.
Remove the Mylar sheet before using the RTC in the processor.
For more information on the RTC and watchdog timer, refer to the
ADSP-BF51x Blackfin Processor Hardware Reference.

LEDs and Push Buttons

The EZ-Board provides two push buttons and three LEDs for gen-
eral-purpose I/O, as well as two additional push buttons intended for
power down and wake functionality, which also can be used as GPIO flag
pins.
The three LEDs, labeled
and pins of the processor (respectively). For information on how to
PH6
program the flag pins, refer to the ADSP-BF51x Blackfin Processor Hard-
ware Reference.
1-24
power pin of the processor. When the EZ-Board is
RTC
through
LED1
ADSP-BF518F EZ-Board Evaluation System Manual
pin. After removing the
RTC
, are accessed via the
LED3
, ,
PH3 PH5