Fujitsu FR20 Manuale Utente
96
CHAPTER 4 External Bus Interface
4.5.3
Little Endian Register (LER)
Bus access of the MB91191/MB91192 series is usually big endian for all areas, but
setting the LER enables one of the areas from 1 to 5 to be handled as a little endian
area.
However, area 0 is not for little endian.
setting the LER enables one of the areas from 1 to 5 to be handled as a little endian
area.
However, area 0 is not for little endian.
■
Little Endian Register (LER)
Figure 4.5-6 Little endian register (LER)
Table 4.5-1 Mode setting using combination of bits (LE2, LE1 and LE0)
LE2 LE1 LE0
Mode
0
0
0
Initial value after reset. No little endian area exists.
0
0
1
Area 1 is handled as little endian. Area 0, 2 to 5 are handled as big endian.
0
1
0
Area 2 is handled as little endian. Area 0 to 1 and 3 to 5 are handled as big endian.
0
1
1
Area 3 is handled as little endian. Area 0 to 2 and 4 to 5 are handled as big endian.
1
0
0
Area 4 is handled as little endian. Area 0 to 3 and 5 are handled as big endian.
1
0
1
Area 5 is handled as little endian. Area 0 to 4 are handled as big endian.
7
6
5
4
3
2
1
0
Initial value
Address: 0000 07FE
H
LE2
LE1
LE0
-----000
B
W
W
W
bit
Access