GE 90-30/20/Micro manual Bit Operation Functions

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Section 5: Bit Operation Functions

Bit operation functions perform comparison, logical, and move operations on bit strings. The AND, OR, XOR, and NOT functions operate on a single word. The remaining bit operation functions may operate on multiple words, with a maximum string length of 256 words. All bit operation functions require WORD data.

Although data must be specified in 16-bit increments, these functions operate on data as a continuous string of bits, with bit 1 of the first word being the Least Significant Bit (LSB). The last bit of the last word is the Most Significant Bit (MSB). For example, if you specified three words of data beginning at reference %R0100, it would be operated on as 48 contiguous bits.

%R0100	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	← bit 1 (LSB)
%R0101	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
%R0102	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33
	−

(MSB)

Note

Overlapping input and output reference address ranges in multi-word functions may produce unexpected results.

GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-47