Pins:
 ("W" pins seem to be controlled directly by FEB0h hardware)

     1     P73                     Touch ring drive output
     2     /RES             TP10   Reset RC circuit
     3     AN10                    10k pull-down resistor
     4     AN11             TP8    Touch ring analog input
     5     VSS              TP15
     6     XTAL                    12 MHz xtal
     7     XTAL
     8     VDD
     9     P10                     N/C
     10    P11                     Power control
     11    P12                     Button SW1, active low
     12    P13                     Button SW3, active low

     13    P14                     Button SW2, active low
     14    P15                     Button SW4, active low
     15    P16                     10k pull-down resistor
     16    P17                     N/C, unused driven output
     17    PWM1                    LEDs
     18    PWM0                    LEDs
     19    VDD
     20    VSS
     21    AN0              TP11   Analog integrator input
     22    P01          W          Integrator reset: when high, integrator quickly falls to zero
     23    P02          W          -V charge pump output (independent freq/phase)
     24    P03          W          Direction: low=output, high=input

     25    P04          W          Modulation clock output (usually 750 kHz when active)
     26    P05                     N/C, unused driven output
     27    P06                     N/C, unused driven output
     28    P07                     Input, 10K pull-down on CTE-450 (part of model-select?)
     29    P20      WRS.9          Mux enable output 3, active low
     30    P21      WRS.8          Mux enable output 2, active low
     31    P22      WRS.7          Mux enable output 1, active low
     32    P23      WRS.6          Mux enable output 0, active low
     33    P24      WRS.5          Mux select output bit 2
     34    P25      WRS.4          Mux select output bit 1
     35    P26      WRS.3          Mux select output bit 0
     36    P27      WRS.2          N/C, unused driven output

     37    D-                      USB Data
     38    D+
     39    VDD
     40    VSS
     41    UFILT                   USB Filter
     42    P33                     N/C, unused driven output
     43    P32              TP3    DBGP2, unused driven output
     44    P31              TP4    DBGP1, unused driven output
     45    P30              TP5    DBGP0 / Test sync out
     46    DPUP                    USB Pull-up
     47    P71                     Touch ring drive output
     48    P72                     Touch ring drive output