Echelon Neuron - Manual (Page 92)

DEALLOC (Deallocate and Return)
The DEALLOC instruction deallocates a specified number of bytes from the data
stack, and performs a return from call operation. The DEALLOC instruction
uses the immediate addressing mode. The specified number of bytes must be in
the range 1 to 8.
Recommendation: Use the _dealloc system function to deallocate more than
eight bytes from the data stack. See _dealloc (Deallocate Stack Space and
Return) for more information.
See also ALLOC (Allocate) to allocate space on the data stack.
The DEALLOC instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The DEALLOC instruction requires a single operand to specify the number of
bytes to allocate on the data stack:
DEALLOC #number
The value of number must be in the range 1..8 The number sign or hash (#) is
required to specify the immediate value.
Table 27 describes the attributes of the DEALLOC instruction.
Table 27. DEALLOC Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
DEALLOC #1 7F 1 6 None
DEALLOC #2 7E 1 6 None
DEALLOC #3 7D 1 6 None
DEALLOC #4 7C 1 6 None
DEALLOC #5 7B 1 6 None
DEALLOC #6 7A 1 6 None
DEALLOC #7 79 1 6 None
DEALLOC #8 78 1 6 None
Example:
The following example allocates two bytes on the data stack as part of a function,
then at the end of the function, deallocates the two bytes from the data stack and
performs a return from call operation.
82 Neuron Assembly Language Instruction Statements