Power Supply Function Of The E1/E2/E2 Lite - Renesas E1 User Manual

E1/E20/E2/E2 Lite Additional Document
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.
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.
R20UT2937EJ0301 Rev.3.01
Jul 1, 2020
3. Notes on Usage
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