ADuC812 Evaluation Board Reference Guide
Evaluation Board Features
A RESET push button is provided to allow the user to manually reset the part. This button is at the input
to the ADM809 (Power on Reset chip) so a delay of 240ms approx will be required for the part to be
actually released from reset after the button is released.
An
,17
push button switch is provided to allow the user perform external interrupts easily. The
,17
signal is Schmitt triggered (U5) to prevent noise on the rising edge of
,17
to cause multiple interrupts
as it passes the trip point. This Schmitt trigger also inverts the signal.
Power Indicator/General Purpose LEDs:
A green power LED (D2) is used to indicate that a sufficient supply is available on the board. A red
general purpose LED (D1) is connected to P3.4 of the ADuC812. An inverter is connected between the
LED and the port pin so that the SETB instruction turns the LED on and the CLR instruction turns the
LED off.
