On Sun, 2 Feb 1997, Simon C Sirin wrote:

>    Someone told me I had to use TRIS op-code,
> but the data book from Microchip says:
>
> "Note: To maintain upward compatibility with
>        future PIC16CXX products, do not use
>        this instruction."

Hi Simon,

Besides this note, my databook also reads:

 "TRIS          Load TRIS Register

  Description:  The instruction is supported for code
                compatibility with the PIC 16C5X prod-
                ucts. Since TRIS registers are read-
                able and writable, the user can directly
                address them."

So you still have to set the TRISB register (0x86h) to enable port B.

Here's another quote from the book:

 "A `1' on any bit in the TRISB register puts the corresponding output
driver in a high impedance mode. A `0' on any bit in the TRISB register
puts the contents of the output latch on the selected pin(s)."

BTW: Initialization condition of TRISB register is all ones.

Luck,

Joost