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CHAPTER 3 CPU
3.9.1
Mode Pins (MD2 to MD0)
The mode pins are three external pins of MD2 to MD0, and enable a combination of
these pins to set, the following:
• Operation modes (RUN mode, flash serial programming mode, flash memory mode)
• Reading reset vectors and mode data
I Setting of Mode Pins (MD2 to MD0)
Table 3.9-2 "Setting of Mode Pins" shows the settings of the mode pins.
Table 3.9-2 Setting of Mode Pins
MD2
0
0
0
0
1
1
1
1
*:Set MD2 to MD0: 0 = V SS or 1 = V CC.
G
Internal vector mode
Reset vectors are read from internal ROM.
G
Flash serial programming mode
Flash serial programming cannot be performed just by the settings of the mode pins.
Reference:
For details on flash serial programming, see CHAPTER 20 DUAL OPERATION FLASH.
G
Flash memory mode
This mode is set when using a parallel writer.
I Setting of Mode Pins
Set the mode pins as shown in Figure 3.9-1.
152
*
Mode Pin
MD1
MD0
0
0
0
1
Setting disabled
1
0
1
1
Internal vector mode
0
0
Setting disabled
0
1
1
0
Flash serial programming mode
1
1
Flash memory mode
Mode Name
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