In the RC4000UM it is stated that (section 4.1.1):
Parallel Port B pins PB2�PB7 can also be used as an auxiliary address bus. However, in the same document (Table 2) is also written that PB0 & PB1 can be used (Alternate use) as External I/O Address IA6 & IA7.
My question is: Can I use only PB2-PB7 as External I/O Address IA0-IA5 and use PB0 as SCLKB (for my SPI clock)? Or, if I use the auxiliary I/O bus it means all the pins of Parallel Port B will be part of the auxiliary I/O bus?