Echelon Neuron - Manual (Page 86)

BRNZ (Branch If Not Zero)
The BRNZ instruction performs a conditional branch if TOS is not zero. The
BRNZ instruction uses one of two addressing modes: absolute and relative. The
BRNZ instruction branches forward or backward with a signed relative
displacement of -126 to +129 bytes if TOS is not zero; otherwise, program
operation continues with the next instruction. TOS is consumed by this
instruction. The displacement expression must resolve at link time to a value in
the range -128 to +127 (two less than the actual displacement because the
displacement calculation includes the size of the BRNZ operation itself).
The Neuron Assembler also supports the use of a label for the displacement
expression; manual calculation of the displacement value is not required.
See also SBRNZ (Short Branch If Not Zero) for a shorter conditional branch with
the same condition, and BRZ (Branch If Zero) for a conditional branch with the
opposite condition.
The BRNZ instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The BRNZ instruction requires a single operand to specify the displacement or
label:
BRNZ displacement
BRNZ label
Table 21 describes the attributes of the BRNZ instruction.
Table 21. BRNZ Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
BRNZ 72 2 4 None
Example:
The following example assumes that the stack already has an array of data
values from which we want to process non-zero values and skip zero values.
search brnz numFnd
br search ; skip zeros
numFnd ...
76 Neuron Assembly Language Instruction Statements