mb91307r Fujitsu Microelectronics, Inc., mb91307r Datasheet - Page 32

• Manufacturer Part Number: mb91307r
• Description: 32-bit Microcontroller Cmos Fr60 Mb91307 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

32
MB91307 Series
•Use of Built-in RAM
Precautions for use of this model
After mode register setting the vector area is an internal area. Therefore before writing to the mode register
it is necessary to rewrite the TBR register so that the vector area is changed to an external area.
The MB91307R contains 128K bytes of internal RAM, and MB91306R contains 64K bytes of internal RAM. To
enable use of this RAM, the mode register must be set to internal ROM external bus mode (ROMA=1).
• The reset vector is fixed at 000F FFFC
• For the MB91307R, the 128K bytes RAM area is from 0004 0000
• In order to use RAM the mode register must be set to internal ROM external bus mode.
• In internal ROM external bus mode the built-in RAM area can be used, but the vector area 000F FFXX
• When placing instruction code in RAM, nothing should be placed in the last 8 bytes of the area 0005 FFF8
64K bytes RAM area is from 0004 0000
prohibited.
internal area and cannot be accessed externally. Please refer to the following explanation.
to 0005 FFFF
FFFF FFFF
0005 0000
0000 0000
0000 0400
0001 0000
0004 0000
0006 0000
0010 0000
H
H
H
H
H
H
H
H
H
After reset release
. (This is an instruction code prohibited area.)
External area
External area
External area
prohibited
Access
I/O
I/O
: The shaded portion is an internal area.
Refer to I/O map
Direct addressing
H
H
area
.
to 0004 FFFF
Internal RAM
External area
H
128K bytes
prohibited
. The area from 0006 0000
prohibited
Access
Access
I/O
I/O
H
Internal ROM external bus mode
to 0005 FFFF
After mode setting
External area
Internal RAM
prohibited
64K bytes
prohibited
Access
Access
I/O
I/O
H
and for the MB91306R, the
H
to 000F FFFF
H
is access
H
is an
H