IP2022 User’s Manual—Instruction Set Architecture www.ubicom.com 215 SUB W,fr Subtract W from fr into W Operation: W = fr - W Bits affected: C, DC, Z Opcode: 0000 100f ffff ffff Description: This instruction subtracts the contents of W from
the   contents   of   the   specified   data   memory
location  and  writes  the  8-bit  result  into  W.  The
data  memory  location  is  left  unchanged.  The
register contents are treated as unsigned values. If the result of subtraction is negative (W is larger
than fr), the C bit is cleared and the lower eight
bits of the result are written to W. Otherwise, the
C bit is set. If there is a borrow from bit 3 to bit 4, the DC (digit
carry) bit is cleared. Otherwise, the bit is set. If the result of subtraction is zero, the Z bit is set.
Otherwise, the Z bit is cleared. Cycles: 1