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Operational Specifications
3.2.1 CPU Power Supply Select Jumpers (JP1)
Rev.1.04
2008.7.10
3-19
REJ10J1564-0104
3
3.2.1 CPU Power Supply Select Jumpers (JP1)
The power voltage supplied to SH7285 can be switched to 3.3V supply or 5V supply by setting JP1.
The power voltage which can be switched in this jumper is only SH7285 (U1). The supply voltages for the
components such as external memories are not changed.
Figure 3.2.2 shows the pin assignments of select jumper for CPU power supply. Table 3.2.1 lists the pin
assignments of jumper for CPU power supply select jumper for CPU power supply.
Top view of the
component side
Board
edge
Board
edge
13
3.3V
JP1 PWRSEL
5V
Figure 3.2.2 Pin Assignments of Select Jumper for CPU Power Supply (JP1)
Table 3.2.1 Pin Assignments of Select Jumper for CPU Power Supply (JP1)
Jumper Setting Function
1-2
5V voltage is supplied to CPU
JP1
PWRSEL
2-3
3.3V voltage is supplied to CPU
: Initial Setting
Note: Do not change jumper settings during the operation of M3A-HS85. Ensure to turn off the power for the
M3A-HS85 before changing jumper settings.