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Rev. 1.10
10 of 20
August 12, 2020
HT32 MCU
Starter Kit User Manual
2 Hardware Layout
Low Speed External Crystal Oscillator (LSE) Option
R21 & R22
Description
Open, LSE I/O pins disconnected from CN4 – default setting
Short, LSE I/O pins connected to CN4 pins 31 and 32. X1 must be removed.
The designators on the ESK32-30105 (HT32F12366 SK) are R23 and R24.
USB D+/D- Option
R26 & R27
Description
Open, USB D+/D- pins disconnected from the CN4 – default setting
Short, USB D+/D- pins connected to the CN4 pins 55 and 56.
The early Starter Kit board or its Target MCU does not have an integrated USB or its USB D+/D-
are not bonded with the GPIO, therefore this option is not available.
MCU Power Jumper – J1
J1
Description
The MCU VDD pin is connected to the 3.3V power – default setting
The MCU VDD pin is disconnected from the 3.3V power
The jumper is useful when it is required to measure the MCU power consumption.
UART Option Jumper – J2
The Starter Kit arranges a group of the Target MCU UART to be used as external communication
interfaces, which can connect to the host computer or other devices. The Target MCU RX pin has
the option of connecting to the e-Link32 UART TX pin or to the extension connector, CN4_6:
RS232_TX.
J2
Description
The MCU UART RX is connected to the extension connector, CN4_6: RS232_TX
– default setting
The MCU UART RX is connected to the e-Link32 UART TX