31
26
GPIO13
DI/DO
General Purpose Digital I/O, Output A of Timer 2, or Capture Input A of Timer 1
27
GROUND
GND
Ground
28
GROUND
GND
Ground
Module Interface Pins
Pin
Description
CLK
Serial interface clock (internal pull-down.)
MISO
Serial interface (master in/slave out.)
MOSI
Serial interface (master out/slave in.)
LOADB
Serial interface load strobe
GPIO16
External interrupt pin tied to the OK button.
GPIO15
External interrupt pin tied to the EXIT button.
GPIO14
External interrupt pin tied to the DOWN button.
GPIO13
PWM signal used to control the audio buzzer.
