
MB91301 Series
36
Memory map
Note : Each mode is set depending on the mode vector fetch after INIT is negated. (For mode setting, see “sMODE
SETTINGS”.)
0000 0000H
0000 0400H
0001 0000H
0002 0000H
0003 E000H
0003 F000H
0004 0000H
0004 2000H
0006 0000H
000E 0000H
000F E000H
000F F000H
0010 0000H
FFFF FFFFH
I/O
I-RAM
1
I/O
I-RAM
1
I/O
I-RAM
1
I/O
I-RAM
1
I/O
I-RAM
1
I/O
I-RAM
1
MB91302A has non-ROM model, the optimal real time OS internal model, and the IPL (Internal program Loader)
internal model by adding the user ROM model.
*1 : On specific area between 10000H and 2000H, 4 Kbyte RAM can be used.
Refer to “sINSTRUCTION CACHE”.
*2 : The real time OS internal model stores the real time OS kernel. The program loader internal model stores
the program loader.
*3 : Non-ROM model supports the external ROM external bus mode only.
Note : Internal ROM emulation : only MB91V301A
Direct
addre
ssing
area
Access
prohib-
ited
Access
prohib-
ited
Access
prohibited
Access
prohibited
Access
prohibited
(MB91302A)
(Single chip
mode)
(MB91302A)
Internal ROM
External bus
mode
(MB91301/302A) *3
External ROM
External bus
mode
(MB91V301)
Internal ROM
External bus mode
(MODR register at
ROMA
= 1)
(MB91V301A)
Internal ROM
External bus mode
(MODR register at
ROAM
= 1)
(MB91V301/ V301A)
External ROM
External bus mode
Internal
RAM
4 Kbytes
Internal
RAM
4 Kbytes
Internal
RAM
4 Kbytes
Internal
RAM
8 Kbytes
Internal
RAM
8 Kbytes
Internal
RAM
8 Kbytes
Internal
RAM
8 Kbytes
Internal
RAM
8 Kbytes
Access
prohib-
ited
Access
prohib-
ited
Internal
ROM
4Kbytes*2
Internal
ROM
4Kbytes*2
Access
prohib-
ited
External
area
External
area
External
area
External
area
External
area
External
area
External
area
Access
prohibit-
ed
External
area
Access
prohibit-
ed
External
area
Internal
RAM
8 Kbytes
emula-
tion
External
area
see
“sI/O
MAP”
I/O
Direct
addre
ssing
area
Direct
addre
ssing
area
Direct
addre
ssing
area
Direct
addre
ssing
area
Direct
addre
ssing
area
see
“sI/O
MAP”
I/O
see
“sI/O
MAP”
I/O
see
“sI/O
MAP”
I/O
see
“sI/O
MAP”
I/O
see
“sI/O
MAP”
I/O
Access
prohib-
ited