January 2012 8.15 Command Set 1687
Word processing
with the
EXCLUSIVE OR
command
Syntax: XO (EXCLUSIVE OR)
Operands: B, W, D, K
Action:
Gate the contents of the word accumulator and the operand with EXCLUSIVE
OR. In accordance with the different data widths of the operands (B = 8 bits;
W = 16 bits; D = K = 32 bits), 8, 16 or 32 bits, respectively, are influenced in
the accumulator. Thus, bit 0 of the accumulator is gated with bit 0 of the
operand, bit 1 of the accumulator with bit 1 of the operand, etc. The control
saves the result of the operation in the word accumulator.
Example:
Gate the contents of byte B5 and byte B6 with EXCLUSIVE OR, and assign the
result to word W8.
Initial state:
Byte B5 = 2A (hex)
Byte B6 = 36 (hex)
Word W8 = ?
Function STL Accumulator
content
Operand content
Load byte B6 into the
word accumulator.
L B6 36 36
Gate the contents of the
word accumulator and
byte B5 with EXCLUSIVE
OR.
XO B5 1C 2A
Assign the gating result to
word W8.
= W8 1C 1C
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