Panasonic FP-E Programming Manual page 75

Specifying hold type and non−hold type registers
There are two types of link data registers, which can be switched when the power is
turned off and the mode is switched from RUN to PROG and operation is stopped.
− Hold type registers, which hold the on or off status in effect immediately prior
to stopping, during the period between stopping and resuming operation
− Non−hold type registers, which are reset when operation stops
In case of using back−up battery, System registers 12 can be used to specify whether
the link data registers are the hold type or non-hold type.
Range
LD0 to LD127
If the beginning of a hold type register is specified using a word number, registers before
that point will be non−hold types, and subsequent registers will be hold types. For
example, if "64" is set for system register 12, LD0 to LD63 will be non−hold types, and
LD64 to LD127 will be hold types.
For the default value, all link data registers are hold types.
If used as link data registers for reception, be aware that no holding operation is carried
out, even if the link data registers are specified as hold types using the system registers.
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System register no.
12
1.3 Explanation of Memory Areas
1 - 51