Mode Data - Fujitsu MB90895 Series Hardware Manual

CHAPTER 3 CPU
3.9.2

Mode Data

Mode data is used to set the memory access mode.It is automatically read to the CPU
by mode fetch.
I Mode Data
The values of the mode register can be changed only in the reset sequence.The changed mode register
values are enabled after the reset sequence.
15 14
13
R/W R/W R/W R/W R/W R/W R/W R/W
R/W Read/Write
X Undefined
Reset value
Table 3.9-3 function of mode register
bit8
to
bit13
bit14
bit15
154
Figure 3.9-2 Mode Data
12 11 10 9 8
bit8 bit9 bit10 bit11 bit12 bit13
Reserved
bit15 bit14
M1
bit name
Reserved: reserved bit Be sure to write "0".
M1, M0: Always set this bit to "00
Bus modes setting bit
Reserved bit
0 Be sure to set this bit to 0.
Bus mode setting bit
M0
Single chip mode
0 0
0 1
1 0
Setting prohibited
1 1
Function
".
B