Undershoot at the E1 FINED pin
Last Updated:05/10/2017
Question:
When I use the E1/E20/E2Lite emulator, an undershoot/overshoot occurs in signals of the MCU communication line (such as JTAG).
Would it be a problem if I continue to use the product as it is?
Answer:
We think the emulator and MCU are not likely to fail immediately because the occurrence of an undershoot/overshoot is not constant. However, if the level of an undershoot/overshoot exceeds the absolute maximum rating, consider implementing the following workaround:
- Insert a damping resistor into the communication line with the MCU.
* The connection example in the E1/E20/E2Lite manual precludes the use of a damping resistor. However, a resistor of a value that causes no harm in communication between emulator and MCU (several tens of ohms, such as 22 Ω or 33 Ω) can be used.Suitable Products
| E1 |
| E20 |
| E2 Lite |