Explanation Of Operation - Fujitsu FR60 Hardware Manual

19.3

Explanation of Operation

This section describes the operation of the data internal RAM/instruction internal RAM
access restriction functions.
■ Operation of the Data Internal RAM/Instruction Internal RAM Access Restriction
Functions
These functions limit the available area of the internal RAM area installed on the device.
Writing to RAM area that has been specified as unavailable is not allowed. In addition, the values read
from the unavailable area are undefined.
In the initial device state, the available data RAM area and instruction RAM area are each limited to 4K
bytes. To use more than 4K bytes requires that the settings of these functions be changed.
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