Holtek e-Link32 - Table 2. Power Configuration - SWD;RESET;UART Interface Voltage Determined by the Target Board Power Supply; Table 3. Power Configuration - MCU with Independent IO Power Supply; Table 4. Power Configuration - Target Board Power Supply Provided by E-Link32;E-Link32 Pro

Rev. 1.30 8 of 34 November 13, 2020
e-Link32/e-Link32 Pro User’s Guide
1 Overview
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Target board power supply provided by the e-Link32/e-Link32 Pro:
The VDD power supply on the SWD interface is supplied with 3.3V by the e-Link32/e-Link32
Pro. In this case, the e-Link32/e-Link32 Pro and the target board MCU will both operate at 3.3V.
Users must take care to ensure that the target board can operate at 3.3V and that the current
does not exceed the e-Link32/e-Link32 Pro allowed current. This conguration is usually used
to simplify the power supply mode during programming. Therefore, the target board does not
require an additional power supply.
The following content describes how to adjust the e-Link32 or e-Link32 Pro resistance jumper to
meet dierent power requirements.
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SWD/RESET/UART interface voltage determined by target board power supply (hardware
factory default value):
The VDD (Pin 1) power supply on the SWD interface is supplied by the target board. The SWD,
RESET and serial communication
(Note)
logic voltages refer to the target board V
DD
voltage.
Table 2. Power Conguration – SWD/RESET/UART Interface Voltage determined by
the Target Board Power Supply
Resistor State Description
R19 Exist Factory default, 10kΩ resistor
R12 Non-exist Factory default
Note: The serial communication function is only available for the e-Link32 Pro.
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MCU with independent IO power supply - for e-Link32 Pro only:
Similar to the previous conguration mode, the only dierence is that the RESET IO voltage
level is determined by the pull-high resistor of the target board nRST.
Table 3. Power Conguration – MCU with Independent IO Power Supply
Resistor State Description
R19 Non-exist Remove R19
R12 Non-exist Factory default
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Target board power supply provided by the e-Link32/e-Link32 Pro:
The VDD (Pin 1) power supply on the SWD interface is provided with 3.3V by the e-Link32/
e-Link32 Pro. The SWD, RESET and serial interface
(Note)
communication logic voltages refer to
the e-Link32/e-Link32 Pro voltage.
Table 4. Power Configuration – Target Board Power Supply Provided by e-Link32/
e-Link32 Pro
Resistor State Description
R19 Exist Factory default, 10kΩ resistor
R12 Exist Add a 0Ω resistor
Note: The serial communication function is only available for the e-Link32 Pro.