Instruction Set Architecture—IP2022 User’s Manual 210 www.ubicom.com SNB fr,bit Test Bit in fr then Skip if Clear Operation: if fr.bit = 0, skip next instruction Bits affected: None Opcode: 0110 bbbf ffff ffff Description: This  instruction  tests  a  bit  in  the  specified  data
memory location. The data memory location and
the bit number (0 through 7) are the instruction
operands. If the bit is 0, the next instruction in the
program is skipped. Otherwise,                                                                               program
execution    proceeds    normally    with    the    next
instruction. Cycles: 1 if tested condition is false, 2 if tested condition
is true Example: snb    STATUS,0;test carry bit
inc    0x099 ;increment if carry=1
nop This  example  tests  the  carry  bit  (bit  0  of  the
STATUS   register).   If   that   bit   is   0,   the   dec
instruction is skipped and the nop instruction is
executed. Otherwise, program                                                                             execution
proceeds normally with the inc instruction.