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MB90335 Series
7.2
Mode Pins (MD2 to MD0)
The mode pin is the three external pins (MD2 to MD0) and specifies the load methods
for the reset vector and the mode data.
■ Setting of Mode Pins (MD2 to MD0)
With the mode pin (MD2 to MD0), you may select either the external data bus or the internal data bus for
the reset vector read and select the bus width while selecting the external data bus. For the internal Flash
ROM products, the mode pin also specifies the Flash ROM write mode to write the internal ROM program
and so forth.
Table 7.2-1 shows the content of the mode pin setting.
Table 7.2-1 Content of Setting of Mode Pins
P61 P60 MD2 MD1 MD0
-
-
0
0
-
-
0
0
-
-
0
1
-
-
0
1
-
-
1
0
-
-
1
0
1
0
1
1
-
-
1
1
Note:
MB90335 series can be used on the single chip mode only. Therefore, please set MD2:0=V
MD1, MD0:1=V
CM44-10137-6E
Mode Name
0
1
0
1
External vector mode
0
1
0
1
Flash writer write mode
.
CC
FUJITSU MICROELECTRONICS LIMITED
Reset vectors
External Data
access area
Bus width
Setting disabled
Internal
Mode Data
Setting disabled
Flash serial writing
-
-
CHAPTER 7 MODE SETTING
7.2 Mode Pins (MD2 to MD0)
Remark
Operation after reset
sequence is controlled with
mode data
-
SS
and
159
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