pins:
 (whole unit)
  * input voltage monitoring		one ADC needed		RA0 = AN0
  * output voltage monitoring		one ADC needed		RA1 = AN1
  * load current monitoring		one ADC needed		RA2 = AN2
  * battery voltage monitoring		one ADC needed		RA3 = AN3
  * 60hz inverter control		two GPIOs:		RA4 = pos phase
								RB0 = neg phase
  * charge SMPS control			one GPIO needed (PWM)	RC2 = CCP1
  * inversion SMPS control		one GPIO needed (PWM)	RC1 = CCP2
  * load relay control			one GPIO needed		RB1
  * host RS232 or USB			two GPIOs needed	RC6 = TX	RC4 = D-
								RC7 = RX	RC5 = D+
  * on/test, off switches		two GPIOs needed	RC6 or RC4 = on/test
						[A		RC7 or RC5 = off
  * source LEDs				one GPIO needed		RB4
  * diag LEDs				one GPIO needed		RC0
  * xtal in				one GPIO/xtal needed	RA6 = CLK0
  * reset/program			one GPIO/reset needed	RE0 = /MCLR
    -- 4 ADCs, 11 digital IOs (2 PWM)	, 15 I/O total
 (battery 0)
  * battery current monitoring		one ADC needed		RA5 = AN4
  * battery gas gauge interface		one GPIO needed		RB5
    -- 1 ADC, 1 digital IOs		, 2 I/O total
 (battery 1)
  * battery current monitoring		one ADC needed		RB2 = AN8
  * battery gas gauge interface		one GPIO needed		RB6
    -- 1 ADC, 1 digital IOs		, 2 I/O total
 (battery 2)
  * battery current monitoring		one ADC needed		RB3 = AN9
  * battery gas gauge interface		one GPIO needed		RB7
    -- 1 ADC, 1 digital IOs		, 2 I/O total
  21 I/O total
  

IO:
	RA0, RA1, RA2, RA3, RA4, RA5, RA6
	RB0, RB1, RB2, RB3, RB4, RB5, RB6, RB7
	RC0, RC1, RC2, RC4, RC5, RC6, RC7
	RE0
	
Unused:
	Not a one.