S3F84B8_UM_REV 1.00 6 INSTRUCTION SET6-286.3.16 COM — COMPLEMENTCOM dstOperation: dst NOT dstThe contents of destination location are complemented (one’s complement); all “1’s” are changedto “0’s”, and vice versa.Flags: C: Unaffected.Z: Set if the result is “0”; cleared otherwise.S: Set if the result bit 7 is set; cleared otherwise.V: Always reset to “0”.D: Unaffected.H: Unaffected.Format:Bytes Cycles Opcode(Hex)Addr Modedstopc dst 2 4 60 R4 61 IRExamples: Given R1 = 07H and register 07H = 0F1H:COM R1 R1 = 0F8HCOM @R1 R1 = 07H, register 07H = 0EHIn the first example, destination working register R1 contains the value 07H (00000111B). Thestatement “COM R1” complements all the bits in R1: all logic ones are changed to logic zeros,and vice-versa, leaving the value 0F8H (11111000B).In the second example, Indirect Register (IR) addressing mode is used to complement the valueof destination register 07H (11110001B), leaving the new value 0EH (00001110B).
