Echelon Neuron - Manual (Page 90)

CALLR (Call Relative)
The CALLR instruction calls a function at the specified forward or backward
signed relative displacement of -126 to +129 bytes. The CALLR instruction uses
the (long) relative addressing mode. 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
CALLR 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.
The CALLR instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The CALLR instruction requires a single operand to specify the displacement:
CALLR displacement
Table 25 describes the attributes of the CALLR instruction.
Table 25. CALLR Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
CALLR 74 2 5 None
Example:
The following example calls a local function named myFilter. This example
assumes that the called function is a nearby function.
callr myFilter
...
myFilter ...
ret ; return to caller
80 Neuron Assembly Language Instruction Statements