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8.2
Mode Pins (MD2 to MD0)
Three external pins, MD2 to MD0, are supported as the mode pins. These are used to
specify how the reset vector and mode data are fetched.
■ Mode Pins (MD2 to MD0)
The mode pins are used to select the data bus (external or internal) used for reading the reset vector and to
specify the bus width when the external data bus is selected.
For a built-in FLASH version, the mode pins are also used to specify FLASH programming mode, which is
used to write programs and other data to internal FLASH.
Table 8.2-1 shows the mode pin settings.
Table 8.2-1 Mode Pin Settings
MD2
0
0
0
0
1
1
1
1
MD2 to MD0: Connect the pins to Vss for 0 and to Vcc for 1.
*: The flash serial write mode cannot be executed by just setting the mode pins. Other terminal also need
to be set. For details, see "CHAPTER 24 EXAMPLE OF F
CONNECTION FOR SERIAL WRITING".
Note:
Because the MB90460/465 series is only used in single-chip mode, set MD2, MD1, MD0 to 011
set M1, M0 to 00
MD1
MD0
Mode name
0
0
0
1
1
0
1
1
Internal vector mode
0
0
0
1
FLASH serial write
1
0
FLASH memory
1
1
.
B
Reset vector
access area
Setting not allowed
Internal
Setting not allowed
-
mode
-
mode
CHAPTER 8 MODE SETTING
External data
bus width
Mode data
-
-
2
MC-16LX MB90F462/F462A/F463A
Remarks
The reset
sequence and
subsequent
sequences are
controlled by
mode data.
-
Mode when the
parallel writer
is used.
and
B
159
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