User`s manual

6.Frequently Asked Questions
6. Frequently Asked Questions
6.1. A communication error occurs at startup.
When a communication error occurs at startup, check the following contents.
1)Ensure the USB_cable and user cable connected.
2)Ensure the power is supplied to the CPU board when using the external power.
6.2. A communication error occurs during debugging.
When a communication error occurs during debugging, check the following contents.
1)The firmware may be out of control by the user's program (out of control or accessing to
monitor area). Remove the USB_cable of FoUSB and connect it again. Restart the
KD38.
2)Communication with FoUSB cannot be performed while the interrupt is disabled. Do not
disable the interrupt.
3)When writing large data with memory writing control (e.g.Fill) at one time,
communication with FoUSB may not be performed. Perform memory writings in several
times.
6.3. Is peripheral I/O operating during a break?
Although interrupts cannot be acknowledged during a break, peripheral I/O continues
operating. If the user's program is halted by a break after starting a timer, the timer
continues counting, but the timer interrupts cannot be acknowledged.
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