IP2022 User’s Manual—Instruction Set Architecture www.ubicom.com 105 ADD fr,W Add fr,W into fr Operation: fr = fr + W Bits affected: C, DC, Z Opcode: 0001 111f ffff ffff Description: This  instruction  adds  the  contents  of  W  to  the
contents  of  the  specified  data  memory  location
and  writes  the  8-bit  result  into  the  same  data
memory   location.   W   is   left   unchanged.   The
register contents are treated as unsigned values. If the result of addition exceeds 0xFF, the C bit is
set  and  the  lower  eight  bits  of  the  result  are
written to the data memory location. Otherwise,
the C bit is cleared. If there is a carry from bit 3 to bit 4, the DC (digit
carry) bit is set. Otherwise, the bit is cleared. If  the  result  of  addition  is zero, the Z  bit is  set.
Otherwise, the Z bit is cleared. A sum of 0x100 is
considered zero and therefore sets the Z bit. Cycles: 1 (3, if jumping by using PCL as the destination)