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NOT (Not)

The NOT instruction performs a logical NOT operation on the value in TOS. The

NOT instruction uses the implicit addressing mode. This instruction clears the

Carry flag.

The NOT instruction applies to Series 3100, 5000, and 6000 devices.

Syntax:

The NOT instruction requires no operands:

NOT

Table 35 describes the attributes of the NOT instruction.

Table 35. NOT Instruction

Instruction Hexadecimal

Opcode

Instruction

Size (Bytes)

CPU Cycles

Required

Affect on

Carry Flag

NOT 3D 1 2 Cleared

Example:

The following example defines a clear_flags function. This function assumes that

flag values to be cleared are in TOS. This function uses the NOT instruction to

invert the passed flag values, then pushes a saved set of flags onto the stack,

performs a logical AND of the inverted flags and the saved flags so that the

passed flag values are cleared, then pops the updated flags to memory.

%clear_flags APEXP ; ( clrMe -- )

not ; ( !clrMe -- )

push flags ; ( flags, !clrMe -- )

and

pop flags ; ( -- )

ret ; return to caller

92 Neuron Assembly Language Instruction Statements

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 236 237

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Echelon Neuron Manuel d'utilisateur Page 102