Echelon Neuron - Manual (Page 104)

OR_R (Or and Return)
The OR_R instruction performs a logical OR for two numbers and performs a
return-from-call operation. The OR_R instruction uses the implicit addressing
mode. The OR_R instruction retrieves both TOS and NEXT from the data stack
and performs a bitwise logical OR for them. TOS and NEXT are consumed, and
the result is placed in TOS. The operation clears the Carry flag. The return-
from-call operation loads the instruction pointer (IP) with the return address
from the return stack.
The OR_R instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The OR_R instruction requires no operands:
OR_R
Table 37 describes the attributes of the OR_R instruction.
Table 37. OR_R Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
OR_R 5E 1 7 Cleared
Example:
The following example performs the operation 2 OR 3 and performs the return-
from-call operation. The example assumes that the return stack contains the
address of the caller to which the OR_R instruction returns.
pushs #2 ; (2, -, -)
pushs #3 ; (3, 2, -)
or_r ; (3, -, -)
The value of TOS after this code executes is 3 because 2 OR 3 = 3. After
completing the logical OR operation, the OR_R instruction performs the return-
from-call operation.
94 Neuron Assembly Language Instruction Statements