Connecting System Ground - Renesas E1 User Manual

E1/E20 Emulator

2.5. Connecting System Ground

The emulator's signal ground is connected to the user system's signal ground.
In the emulator, the signal ground and frame ground are connected.
In the user system, connect the frame ground only; do not connect the signal ground to the frame ground (Figure
2.6).
If it is difficult to separate the frame ground from the signal ground in the user system, set the GND for DC power
input (AC adapter) of the host computer and the frame ground of the user system as the same potential. If the GND
potential is different between the host computer and the user system, an overcurrent will flow in the low-
impedance GND line and thin lines might be burned.
Connecting System Ground :
Separate the frame ground from the signal ground at the user system. Failure to do so will result in
smoke, fire, or an electric shock due to the difference in ground potential.
Signal ground
Host
computer
Figure 2.6 Connecting System Ground
For a debugging environment where there is a GND gap between the user system and host PC, use the isolator
for the E1 emulator (R0E000010ACB10 / R0E000010ACB20) or the isolator for the E20 emulator
(R0E000200ACB10) that are separately available from Renesas.
R20UT0398EJ0401 Rev.4.01
Mar 15, 2016
E1/E20 emulator
Logic
USB
Power
supply
WARNING
Signal Signal
Signal ground Signal ground
Frame ground
Setup
User system
Logic
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