Instruction Set Architecture—IP2022 User’s Manual 220 www.ubicom.com Example 1: subc  0x099,w This example subtracts the contents of W and the
complement   of   the   C   bit   from   data   memory
location 0x099. For example, if the data memory
location holds 0x35, W holds 0x06, and the C bit
is clear, this instruction subtracts 0x07 from 0x35
and writes the result 0x2E into the data memory
location. It also sets the C bit, clears the DC bit,
and clears the Z bit. Example 2: mov    w,0x095;load W from 0x095
sub    0x097,w;subtract low bytes                          ;C = 0 for borrow out
mov    w,0x096;load W from 0x096
subc  0x098,w;subtract high bytes This example performs 16-bit subtraction of data
memory  locations  0x095  (low  byte)  and  0x096
(high  byte)  from  data  memory  locations  0x097
(low byte) and 0x098 (high byte). The  sub  instruction  subtracts  the  contents  of
0x095 from 0x097 and clears the C bit if a borrow
occurs out of bit 7, or sets the C bit otherwise. The subc instruction subtracts the contents of 0x096 from 0x097 with borrow-in using the C bit.