GE 90-30/20/Micro Section 5: Bit Operation Functions

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

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.