MCLR 1   28 AVdd
  VREF+ CVREF+ C3INC CTED1 PGED3 AN0 RPA0 RA0 2   27 AVss
  VREF- CVREF-       CTED2 PGEC3 AN1 RPA1 RA1 3   26 RB15 RPB15 AN9  SCK2 C3INA CTED6 PMCS1 
   C1IND C2INB C3IND       PGED1 AN2 RPB0 RB0 4   25 RB14 RPB14 AN10 SCK1 C3INB CTED5 CVrefOut 
   C1INC C2INA      CTED12 PGEC1 AN3 RPB1 RB1 5   24 RB13 RPB13 AN11            CTPLS 
   C1INB C2IND      CTED13  SDA2 AN4 RPB2 RB2 6   23 Vusb
   C1INA C2INC      RTCC    SCL2 AN5 RPB3 RB3 7   22 RB11 RPB11 PGEC2 D-
                                          Vss 8   21 RB10 RPB10 PGED2 D+ CTED11
                                OSC1 RPA2 RA2 9   20 Vcap
                                OSC2 RPA3 RA3 10  19 Vss
                               SOSCI RPB4 RB4 11  18 RB9  RPB9 SDA1 CTED4   
                    CTED9 T1CK SOSCO RPA4 RA4 12  17 RB8  RPB8 SCL1 CTED10  
                                          Vdd 13  16 RB7  RPB7 INT0 CTED3   
                                     RPB5 RB5 14  15 Vbus
=== General i/o ===
ANx: analog inputs
RAx, RBx: bidirectional i/o port pins
RPAx, RPBx: reassignable port pins configurable with Peripherial Pin Select (PPS)
== Specific signals ===
CTEDx: Charge/Time Measurement external edge inputs for precision timing and capacitative touch interfaces
CTPLS: Charge/Time Measurement output pulse
CxINA, CxINB, CxINC, CxIND: Comparator inputs (comparator outputs are on PPS)
D+, D-: USB data lines
ICx: (input capture channels are on PPS)
INTx: external interrupts
OCx: output compare channels (PWM) (output compare outputs are on PPS)
OCFA, OCFB: output compare fault input (output compare fault inputs are on PPS)
OSC1, OSC2: crystal oscillator control
PGEDx, PGECx: programming data, clock
RTCC: real time clock alarm output
SCKx: SPI clock output (other SPI signals are on PPS)
=== note I2C errors ===
(read the errata sheet http://people.ece.cornell.edu/land/courses/ece4760/PIC32/Microchip_stuff/Erata_PIC32MX.pdf)
SCLx: I2C clock output 
SDAx: I2C data line 
=======================
SOSCI, SOSCO: 32.768 KHz low power crystal control
T1CK: timer external clock input (other clock inputs are on PPS)
UxRX, UxTX: USART transmit/receive lines
VREF: external voltage reference for ADC (defaults to internal)
CVREF: external voltage reference for CVrefOut (defaults to internal)
CVrefOut: variable voltage reference output