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+HHKB Power consumption
+----------------------
+
+**Power consumption
+ board clock/prescaler keyswitch power ctrl current
+ --------------------------------------------------------------------------
+ tmk 16MHz no no 26.4mA
+ tmk 16MHz pro1 no 45.1mA
+ tmk 16MHz/2 no no 18.1mA
+ tmk 16MHz/2 pro1 no 37.3mA
+ tmk 8MHz no no 18.9mA
+ tmk 8MHz pro2 no(w/o FET) 32.1mA
+ tmk 8MHz pro2 no(w FET) 32.1mA withou POWER_ON/FF
+ tmk 8MHz pro2 no(w FET) 32.6mA with POWR_ON/OFF
+ tmk 8MHz pro2 15ms(w FET) 21.3mA with POWR_ON/OFF, enumerated but error -32
+ tmk 8MHz pro2 60ms(w FET) 13.3mA with POWR_ON/OFF, not enumerated
+
+ gh60 16MHz 25.8mA
+ gh60 16MHz USB suspend w LED breathing 17.6-29.1mA
+ gh60 16MHz USB suspend w/o LED 0.2mA(0.231-0.276mA)
+ Poker 5.6mA
+ Poker USB suspend 0.3mA(0.301mA)
+ gh60 16MHz stock firmware by komar 26.8mA
+
+
+ HHKB pro2 Over All 139.4mA
+ HHKB pro2 Controller 115.1mA
+ HHKB pro1 Controller 25.9mA
+
+
+keyswitch power consumption:
+pro1: 45.1-26.4=18.7mA
+ 37.3-18.1=19.2mA
+pro2: 32.1-18.9=13.2mA
+
+
+
+
+
+**Low Freq Crystal or Prescaler?
+No advantage of Low Freq Crystal against Prescaled.
+
+Clock routing
+X'tal --+---->Prescaler-------> System Clock
+ |
+ +---------------------> USB PLL
+
+Design Decision: Install 16MHz crystal on board with using clock rescaler.