Addressing - Fujitsu MB90895 Series Hardware Manual

3.1.3

Addressing

Linear and bank types are available for addressing.
2
The F MC-16LX family basically uses bank addressing.
• Linear type: direct-addressing all 24 bits by instruction
• Bank type: addressing higher 8 bits by bank registers suitable for the use, and lower
16 bits by instruction
I Linear Addressing and Bank Addressing
The linear addressing is to access the 16-MB memory space by direct-addressing. The bank addressing is to
access the 16-MB memory space which divided into 256 64-KB banks, by specifying banks and addresses
in banks.
Figure 3.1-4 "Memory Management in Linear and Bank Types" shows overview of memory management
in linear and bank type.
000000
1 2 3 4 5 6
FFFFFF
Figure 3.1-4 Memory Management in Linear and Bank Types
Linear types
H
H
H
All is divided by an instruction
bank types
000000
H
00 Bank
00FFFF
H
010000
H
01 Bank
01FFFF
H
0 2 0 0 0 0
H
02 Bank
02FFFF
H
12 Bank
1 2 3 4 5 6
H
FD0000
H
FD Bank
FDFFFF
H
FE0000
H
FE Bank
FEFFFF
H
FF0000
H
FF Bank
FFFFFF
H
Divided by an instruction
divided by using the bank register
CHAPTER 3 CPU
64KByte
25