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NOT instruction
Coding:
(MOD - modifier: affects on operands type - word/byte;OP - operand)
Description:
not OP ==> OP
This instruction applies logical operation NOT (0 changes to 1 and
vice versa) to OP and writes the result back to OP. Flags N and Z are
set according to the result.
Examples:
0E12 |
not R2 ==> R2 |
the R3 value will be inverted and stored to R2 |
0E16 |
not (R2) ==> (R2) |
instruction will invert the value of memory cell,
which address stores in R2 |
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PUSH instruction
Coding:
(OP - operand)
Description:
OP ==> stack
This instruction places OP to stack (OP is always word!).
Flags N and Z are set accoring to OP.
Examples:
0E20 |
R0 ==> stack |
the R0 valur will be saved in stack |
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POP instruction
Coding:
(OP - operand)
Description:
stack ==> OP
This instruction restores OP from stack (OP is always word!).
Flags N and Z are set accoring to OP value.
Examples:
0E30 |
stack ==> R0 |
the R0 valur will be loaded from stack |
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ADD SP instruction
Coding:
(OP - operand)
Description:
SP + OP ==> SP
This instruction adds OP to SP register. Flags N and Z are set
accoring to result.
Examples:
0E40 |
SP + R0 ==> SP |
SP will be increased by R0 value |
0E4D
0010 |
SP + 10 ==> SP |
this instruction will increase SP value
by constant 10 |
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SUBTRUCT SP instruction
Coding:
(OP - operand)
Description:
SP - OP ==> SP
This instruction subtracts OP from SP register. Flags N and Z are
setting according to result.
Examples:
0E50 |
SP - R0 ==> SP |
SP will be dereased by R0 value |
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MOVE TO SP instruction
Coding:
(OP - operand)
Description:
OP ==> SP
This instruction moves OP to SP register. Flags N and Z are set
accoring to result.
Examples:
0E60 |
R0 ==> SP |
R0 value will be placed to SP |
0E6D
00F000F0 ==> SP |
this instruction makes SP equal to 00F0 - constant
from the second word of instruction |
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MOVE FROM SP instruction
Coding:
(OP - operand)
Description:
SP ==> OP
This instruction moves a value from SP register to OP. Flags N and Z are set
accoring to result.
Examples:
0E70 |
SP ==> R0 |
SP value will be placed to R0 |
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PUSH PS instruction
Coding:
Description:
PS ==> stack
This exotic instruction places the value from the processor status register
PS to stack. It may be used to save the results of comparison for later analysis.
Examples:
0E80 |
PS ==> stack |
processor status register will be saved to stack |
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POP PS instruction
Coding:
Description:
stack ==> PS
This instruction restores PS from stack. Flags N and Z are set
according to this PS value.
Examples:
0E90 |
stack ==> PS |
the PS value will be loaded from stack |
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SHIFTS
Shifts are also unary operations, but they are placed to a
separate topic.
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