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6 Troubleshooting
6. Troubleshooting
6.1 FoUSB cannot communicate with the Target MCU Why?
It is possible that the firmware written in the USB Monitor Board has gone wild. In such a
case, temporarily remove the USB Cable and insert it back into position.
6.2 The MCU cannot enter standerd serial I/O why?
1) Check to see that the Busy signal is connected to the writer’s connector accurately.
2) Check to see that the Reset signal is pulled up (5K) on a board.
6.3 The MCU cannot be programmed using FoUSB Why?
Check to see that the MCU type name displayed in FoUSB and that of the Target MCU
match.
6.4 FoUSB cannot operate Why?
When FoUSB (Flash-over-USB) is started in the state where your host computer (PC),
USB Cable, USB Monitor Board, Flat Cable, and Target Board are connected, the
firmware of USB MCU is erased or damaged if the following window (see Figure 6-1) is
displayed.
Moreover, when firmware is erased or damaged (the status display of USB Monitor Board
lights only a Power indicator), FoUSB and KD (KD30, KD3083) cannot be used.
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