I think there's a small error in the MCF548x Reference Manual.
On page 2-2, Figure 2-1. MCF548x Signals, it lists FBCS[5:1] / PFBCS[5:1] (I've underlined instead of overlined)
Beneath it, it has FBCS0 with no overline/active low signal.
It also show's it again on page 2-3
However, on page 2-11 it has the over line for FBCS0
Also again in Section 126.96.36.199 on page 2-16.