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Operational Specifications
3.2.2 External Power Supply Select Jumpers (JP2, JP3, and JP4)
Rev.1.00
Oct 09, 2008 3-18
REJ11J0021-0100
3
3.2.2 External Power Supply Select Jumpers (JP2, JP3, and JP4)
Set JP2 to JP4 to switch the power voltage source to the SH7137 system power (CPU-VCC), the analog power supply (AVCC),
and the A/D reference power supply (AVREF).
Figure 3.2.3 shows the external power supply select jumper assignments. Table 3.2.2 lists the external power supply select
jumper setting.
Figure 3.2.3 External Power Supply Select Jumper Assignments (JP2,JP3,JP4)
Table 3.2.2 External Power Supply Select Jumper Setting (JP2,JP3,JP4)
No. Setting Function
1-2
SH7137 power supply voltage (CPU-VCC) is supplied from J4 or J7
JP2
CPU-VCC SEL
Open External power supply voltage (supplied from J5 or H9)
Do not leave the jumper open not supplying the power from an external source.
1-2
SH7137 AVREF is connected to 5 V fixed power supply voltage
JP3
AVREFSEL
Open External power supply voltage (supplied from J8 or H10)
1-2
SH7137 AVCC is connected to the 5 V fixed power supply voltage
JP4
AVCCSEL
Open External power supply voltage (supplied from J8 or H11)
indicates the default setting.
Note: Do not make any change with the jumper setting while the M3A-HS37 is operating. Ensure to turn the power OFF
before changing the setting.