SECTION IV-2: ADDLW Instruction and the Status Register

Here we will examine the impact of the ADDLW instruction on the flag bits C, DC, and Z of the status register. All the flag bits C, Z, DC, OV and N are affected by the ADDLW instruction. Here we will discuss and focus only on flag C, DC, and Z there are related to unsigned number operations.

Not All Instructions Affect the Flags:-

Some instructions affect all the five flag bits C, DC, Z, OV and N. example ADDLW. Some instructions affect no flag bits at all. The move instructions does not affect flag bits . Except MOVF. Some instructions affect only the Z or N flag bits, or both. The logic instructions are in this category. Example ANDWL.