E1/E20/E2/E2 Lite Additional Document
R20UT1994EJ0900 Rev.9.00
Page 39 of 58
Jan.20.22
3.1.2
When Power is Supplied to the User System from the Emulator (E1/E2/E2 Lite Only)
<When using the emulator>
(1) Connect the user system.
Connect the emulator and the user system with a user-system interface cable.
When the external trigger input/output function is to be used with the E2, connect the pins to be used.
(2) Connect the host machine and turn on the emulator.
Connect the emulator and the host machine with a USB interface cable, then turn on the emulator.
(3) Launch the emulator debugger or programming software.
Launch the emulator debugger or programming software and select the setting of power supply to the
user system.
(4) Connect the emulator debugger or programming software to the emulator.
Connections may vary depending on software.
<When finished using the emulator>
(1) Disconnect the emulator debugger or programming software from the emulator.
Disconnections may vary depending on software.
(2) Close the emulator debugger or programming software.
Close the emulator debugger or programming software.
(3) Turn off the emulator and disconnect the emulator.
Disconnect the USB interface cable from the emulator, then turn off the emulator.
(4) Disconnect the user system.
Disconnect the user system interface cable from the user system.
When the external trigger input/output function is to be used with the E2, disconnect the pins that were in
use.
3.2
Power Supply Function of the E1/E2/E2 Lite
When using the power supply function of the E1/E2/E2 Lite, check the voltage supplied to the user system.
Particularly when the 5.0-V supply option is selected, the voltage depends on the USB VBUS power-supply
voltage.
E1: The voltage may drop by 0.5 V or more below 5.0 V.
E2: The voltage may drop by 0.3 V or more below 5.0 V.
Note that the E2 Lite supports power supply of 3.3 V only.
When debugging a system with two power supplies (VDD, EVDD, etc.) to the MCU, power cannot be
supplied from the E1/E2/E2 Lite.
For the E2, 1.8 V to 5.0 V can be specified as the supply voltage and 0 V can also be specified during
execution of the user program. However, when an extended function is specified, do not set the voltage to 0
V during execution of the user program.
When the supply voltage is set to 0 V by the E2 during execution of the user program, continued debugging
may not be possible if the voltage on the TOOL0 pin is unstable during the voltage drop. Also refer to the
notes in section 2.5.2, TOOL0 Pin.
