Pullups

jjude · Joined: 12 Nov 2007 Posts: 37

I write code 16f628a and 16f819 chip.
I need pullup-resistor port B.
Which is best style:
port_b_pullups(TRUE); or
port_b_pullups(0b11111111);

Sorry my bad english.

elm383 · Joined: 13 Jul 2007 Posts: 7

Depends on the PIC model you are using. Try looking in the CCS HELP (press F1 and search for PORT_x_PULLUPS ( ) ). If I'm not mistaken, for your case, you can't enable individual bits and only one control bit is used to either to turn all on or off. Meaning you'll have to go with just TRUE. TRUE is defined for boolean 1. If you put 0x11111111, this is equivalent to 255 in decimal.

(At least this is from what I personally understand.)