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1.7
USB Function
This board comes with one USB up-port (1) and two USB down-ports (2). Please review the usage conditions
described below before setting each port.
To enable detection of the self-power mode (external power supply) on 38K0/38K2, insert a header link to the
Power INT jumper (3). The detection signal is assigned to port P50/INT0.
To initiate an external remote wake-up interrupt on 38K0/38K2, insert a header link to one of the wake-up
jumpers (Wake-up 1 to 3 in 4). The detection signal will be assigned to either P50, P51, or P52, accordingly,
and an external interrupt can be generated to 38K0/38K2 using the remote wake-up button (5).
* USB Hub Function
To use the USB hub, switch both the hub circuit connection switch and the down-port connection switch (6) to
ON. This will assign the necessary circuits to the USB hub, and the hub will be enabled for operation. Keep
these switches OFF at all other times.
To test the generation of an over-current on the down-port of the USB hub, insert a header link to the Current
INT jumper (7). The test signal will be assigned to Port P51/CNTR0, and the over-current test button will be
enabled (although a real over-current will not be generated).
8. OverCurrent test
button
Press to test over-current
generation on down-port
Figure 1.7 USB Peripheral Circuits Setup Areas
10
5. Remote WakeUp test button
Press to test remote wake-up function
3. Connection to INT0
Assigns external power ON/OFF
event to INTO interrupt.
1. UP
2. DP1
2. DP2
RENESAS
USB F
ull-Speed Microcomputers
38K0/38K2
4. Remote WakeUp assigns
Connection Switch
Turn all ON when using
38K2.
7. Current Output
Jumper 51/CNTR0
Group
M3A-8K02
jumper for test use
6. Hub Circuit
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