> Why bother clearing TRISB

All the PICs I've used have their pins set to inputs on power-up,
ie TRIS is all '1'. From what I know, this is true for every family.
CLRF TRIS sets them all to output

Simply put, for general use -

PORT is the state of the pins (read)
LAT is the value to write to a pin (write)
TRIS is the data direction

Using PORT for output leaves you vulnerable to read-modify-write
problems, because PORT will read the pin before writing to the
latch, which is also the architecture of LAT-less pre-18F PICs

You can also read LAT, which returns the contents of the output
latch

Read Section 30 for more detail

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den532310

I don't think any PICs with LAT need BANKSEL

Joe
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