User manual

INPUT/OUTPUT:
Trimmer pot: Trimmer potentiometer 10K connected to RA0/AN0
Buttons: four user buttons are available:
Button1 connected to RB5 with pullup, when the
button is pressed the RB5 is read as 0, otherwise as 1
Button2 connected to RB4 with pullup, when the
button is pressed the RB4 is read as 0, otherwise as 1
Button3 connected to RB7 via B3_E SMD jumper with
pullup, when the button is pressed RB7 is read as 0,
otherwise as 1
Button4 connected to RB6 via B4_E SMD jumper with
pullup, when the button is pressed RB6 is read as 0,
otherwise as 1
Please do not press Button3, Button4 during debug as
they share PGC PGD microcontroller ports which are
used for programming/debugging.
LEDs: four LEDs are available:
LED1 connected to RD0, logic 1 turn LED ON, logic 0
turn LED OFF
LED2 connected to RD1, logic 1 turn LED ON, logic 0
turn LED OFF
LED3 connected to RD2, logic 1 turn LED ON, logic 0
turn LED OFF
LED4 connected to RD3, logic 1 turn LED ON, logic 0
turn LED OFF
AUDIO: MIC input connected to RA5/AN4 ADC input via pre-
amplifire, can take signal from external microphone.
HEADPHONE output from RC1 output via power
amplifier LM386 can drive headphones.