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AND instruction
Coding:
(MOD - modifier: affects on operands type - word/byte, or maybe
specifies "short constant"; OP1 and OP2 - operands)
Description:
OP2 and OP1 ==> OP2
This instruction makes a logical AND between R2 and R1. The result
is stored to R2. Flags N and Z are set accoring to the
result.
Examples:
0712 |
R2 and R1 ==> R2 |
the result of logical AND between R2 and R1 will be stored to R2 |
0750 |
R0 and (R1) ==> R0 |
logical AND between two values: from R0
and from the memory, which address is stored in R1; the result will be
placed into R0 |
07D3
FFFE |
R3 and FFFE ==> R3 |
reset the least significant bit of
R3 (if a bit of the constant is set, the result will repeat the same bit
in R3; in other case, the result bit will be zero without reference to the
second operand!) |
3723 |
R3 and (-2) ==> R3 |
this instruction will do exastly the same
action, because the "short constant" -2 is presented as FFFE |
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Coding:
(MOD - modifier: affects on operands type - word/byte, or maybe
specifies "short constant"; OP1 and OP2 - operands)
Description:
OP2 or OP1 ==> OP2
This instruction makes a logical operation OR between OP1 and OP2 and
writes the result to OP2. Flags N and Z are set accoring to the result.
Examples:
0812 |
R2 or R1 ==> R2 |
the result of logical OR between R2 and R1 will
be stored to R2 |
083D
C000 |
R3 or C000 ==> R3 |
this command will set two most significant
bits in R3 (if a bit of the constant is reset, the result will repeat the same
bit in R3; but if it is set, the result bit will be equal to 1 without reference
to second operand!) |
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Coding:
(MOD - modifier: affects on operands type - word/byte, or maybe
specifies "short constant"; OP1 and OP2 - operands)
Description:
OP2 xor OP1 ==> OP2
This instruction makes a logical operation XOR (eXclusive OR) between OP1 and OP2 and
writes the result to OP2. Flags N and Z are set accoring to the result.
Examples:
0912 |
R2 xor R1 ==> R2 |
the result of logical XOR between R2 and R1 will
be stored to R2 |
09D3
A5A5 |
R3 xor A5A5 ==> R3
| this instruction will give zero result, if R3 value
is equal to constant A5A5 from the second word of command;in all other cases, the different
bits will be set |
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NOT instruction
Logical operation NOT has only one operand. So it is
described in the topic "Unary operations".
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