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參數(shù)資料
| 型號： | FR65E |
| 廠商： | Fujitsu Limited |
| 英文描述： | 32-Bit Microcontroller |
| 中文描述： | 32位微控制器 |
| 文件頁數(shù)： | 27/87頁 |
| 文件大小： | 369K |
| 代理商： | FR65E |
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MB91307B
27
Use of Built-in RAM
The MB91307B provides 128 KB of built-in RAM. To enable use of this RAM, the mode register must be set to
internal ROM external bus mode (ROMA=1).
Precautions for use of this model
The reset vector is fixed at 000F_FFFC
H
.
For the MB91307B, the 128Kbyte RAM area is from 0004_0000
H
to 0005_FFFF
H
. The area from 0006_0000
H
to 000F_FFFF
H
is access prohibited.
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
H
is an
internal area and cannot be accessed externally. Please refer to the following explanation.
When placing instruction code in RAM, nothing should be placed in the last 8 bytes of the area 0005_FFFF8h
to 0005_FFFF
H
. (This is an instruction code prohibited area.)
0000 0000
H
0000 0400
H
0001 0000
H
0004 0000
H
0006 0000
H
0010 0000
H
FFFF FFFF
H
I/O
I/O
I/O
I/O
The shaded sections indicate internal areas
Direct addressing
area
Refer to I/O map
Access
prohibited
External area
Access
prohibited
External area
After reset release
After mode setting
Internal ROM external bus mode
Internal RAM
128 KB
Access
prohibited
External area
External area
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.
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