Echelon Neuron - Manual (Page 87)

BRZ (Branch If Zero)
The BRZ instruction performs a conditional branch if TOS is zero. The BRZ
instruction uses the relative addressing mode. The BRZ instruction branches
forward or backward with a signed relative displacement of -126 to +129 bytes if
TOS is 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 BRZ
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 SBRZ (Short Branch If Zero) for a shorter conditional branch with the
same condition, and BRNZ (Branch If Not Zero) for a conditional branch with the
opposite condition.
The BRZ instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The BRZ instruction requires a single operand to specify the displacement or
label:
BRZ displacement
BRZ label
Table 22 describes the attributes of the BRZ instruction.
Table 22. BRZ Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
BRZ 73 2 4 None
Example:
The following example assumes that the stack already has an array of data
values from which we want to process zero values and skip non-zero values.
search brz zeroFnd
br search ; skip non-zeros
zeroFnd ...
Neuron Assembly Language Reference 77