Memorymap; Memory Configuration - Mitsubishi Melsec A User Manual

3.
SPEclFlcATloNs
/MELSEC
3.4 Memory Map
3.4.1 Memory configuration
The AD51 is a 2-80 based system. To expand the memory size from
64K bytes the second 32K bytes are duplicated in additional chan-
nels as shown in Fig. 3.2 below.
Common
area
2K bytes
Memory channel 0
O O O O H
0s
7FFFH
Channel
12K bytes
6000H t o 67FFH 12K bytes1
RAM user work
area.
8000H
AOOOH
COOOH
r
EOOOH
FFFFH
1 - 1
RAM or R O M
On board
R A M or
ROM
On
board
RAM w ROM
On board
On
board
R A M or R O M
On board
R A M or R O M
On board
R A M
w
R O M
On b a r d
2
Bytes w i t h the following head addresses i n the User
Woik area are used far direct accessing o f the General-
Purpose
110
assigned t o the AD51 using the PEEK and
POKE commands (see section 7.1.1
1:
'2
Channels 3 and 4 become available
When ROM is loaded
I
I
u
User memory area (Max. 112K bytes) *3: Buffer memory
I16 bit)
Fig. 3 . 2 Memory Map
'OINT
I
'(1) The RAM user work area, (addresses 6000H to 67FFH)
is in the common area and can be accessed by the user
programs in any of channels
1
to
4.
' ( 2 ) The memory area may be expanded by adding ROM to
channels 1 and/or 2.
*(3) The buffer address range is O O O H to BFFH which re-
presents 3K words
(6K
bytes) of buffer memory. Each
buffer memory address represents 1 word. (i.e. 16 bits)
3-10
IB
INN
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