Chapter 19 Data Internal Ram/Instruction Internal Ram; Overview - Fujitsu FR60 Hardware Manual

CHAPTER 19 DATA INTERNAL RAM/INSTRUCTION INTERNAL RAM ACCESS RESTRICTION FUNCTIONS
19.1

Overview

The access restriction functions limit the available area of the internal RAM area
installed on the device. In initial device state, the available area is limited to 4K bytes.
To use more than 4K bytes requires that the settings of these functions be changed.
■ Data Internal RAM/Instruction Internal RAM Access Restriction Function Registers
The registers used by the data internal RAM/instruction internal RAM access restriction functions are as
follows:
■ Block Diagram of the Data Internal RAM/Instruction Internal RAM Access Restriction
Functions
Figure 19.1-1 is a block diagram of the data internal RAM/instruction internal RAM access restriction
functions.
Figure 19.1-1 Block Diagram of the Data Internal RAM/Instruction Internal RAM
576
Address
Address
Access Restriction Functions
D-bus (data)
Register
value
DRLR
F-bus (instruction/data)
Register
value
FRLR
00000390
DRLR
H
00000280 FRLR
H
D-bus RAM control circuit
D-bus RAM
F-bus RAM control circuit
F-bus RAM