R928 MCU选择

So I would take an MCU F427VI 2M VG 1M or F437VI. But the 429er and 439er go 

ed: 
could mean: 
- prohibited (can not be changed) 
- caution (they leave the reliable region - at your own risk) 

yellow: 
- can go, but need not 
- affect the performance may 

know: 
- this is the default 
- all ok 

orange: 
- stronger warning as yellow 

green: 
- value is in the recommended range

Wherever two possible interpretations, one could introduce a further distinguishing feature. This can be another color, or something extra. For example, the default value asterisk anticipated. Or "prohibited" in an exclamation point advance. 

Without that we know where we want to, we can not start running. At least makes little sense. 

vy 73 
Andreas