Fujitsu FR60 Hardware Manual page 162

CHAPTER 3 CPU AND CONTROL UNITS
[bit26] ROMA (Internal ROM enable bit)
This bit sets whether to making built-in F-bus RAM and F-bus ROM region effective.
Table 3.14-2 Function of internal ROM enable
ROMA
0
1
*: EVA product has the built-in 8K bytes RAM. So the EVA product can be set. For details, see
"■ Memory Map" in "3.1 Memory Space".
[bit25, bit24] WTH1, WTH0 (Bus width setting bit)
These bits specify the bus width to be used in external bus mode.
In external bus mode, this value is set in the DBW1 and DBW0 bits in ACR0H (the CS0
area).
Table 3.14-3 shows the settings for the initial bus width.
Table 3.14-3 Settings of the Initial Bus Width
WTH1
0
0
1
1
Note:
The mode data for setting mode vector should be set at 000FFFF8
endian uses big endian. Please set to the upper byte of bit31 to bit24.
False
True
142
Function
External ROM mode
Internal ROM mode
WTH0
0 8 bits
1 16 bits
0 32 bits
1 Single chip mode
Figure 3.14-3 Note on Mode Data
bit 31 24 23
000FFFF8
XXXXXXXX
H
bit 31 24 23
000FFFF8
Mode Data
H
000FFFFC
H
Built-in F-bus region (40000
an external region.
Built-in F-bus region (40000
access prohibited.*
Bus width
External bus mode
External bus mode
External bus mode
16 15
XXXXXXXX XXXXXXXX
16 15
XXXXXXXX XXXXXXXX
Reset Vector
Remark
to 100000 ) becomes
H H
to 100000 ) becomes
H H
Remarks
as byte data. FR family's byte
H
8 7 0
Mode Data
8 7 0
XXXXXXXX