Take a conditional branch if the carry bit is reset (clear/0)

Table

BCC | Branch on Carry Clear
================================================

                                 N V - B D I Z C
                                 - - - - - - - -

addressing       assembler    opc  bytes  cycles
------------------------------------------------
relative         BCC $nnnn    90     2     2 tp

p: +1 if page is crossed
t: +1 if branch is taken