Echelon Neuron - Manual (Page 72)

BRZ Branch if zero
DBRNZ Decrement and branch if not zero
SBRNZ Short branch if not zero
SBRZ Short branch if zero
Unconditional Program Control Operations
ADD_R Add and return
AND_R And and return
BR Branch
BRF Branch far
CALL Call near
CALLF Call far
CALLR Call relative
DEALLOC Deallocate and return
DROP_R Drop from stack and return
OR_R Or and return
RET Return from call
SBR Short branch
XOR_R Exclusive or and return
Other Operations
NOP No operation
The following sections describe each of the Neuron Assembler instructions. The
description for each instruction includes a table with the following information:
• The hexadecimal representation of the instruction’s opcode
The opcode is the part of a machine instruction that informs the processor
of the type of operation to be performed and the type of data to be used.
The first byte of an instruction is its opcode, and remaining bytes are its
data. Some Neuron machine instructions have variable opcodes because
data is included in the opcode so that the instruction’s size can be as
small as possible.
• The size of the instruction, in bytes
Each machine instruction requires either one, two, or three bytes of
62 Neuron Assembly Language Instruction Statements