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Holtek HT32 Manualline

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HT32 MCU Hardware Development Guideline
D/N: AN0630EN
Introduction
This application note provides HT32 MCU system designers with relevant information regarding
hardware implementation, including circuit board functions such as power, clock management, reset,
boot mode settings, debug management and so on. It introduces how to use the HT32 MCUs and
describes the minimum hardware resources required for actual applications. The purpose is to assist
users who are new to the HT32 MCUs to quickly implement their corresponding circuit design.
Power and Reset of HT32 Series
The MCU power scheme varies according to different devices, therefore the actual conditions and
parameters should be obtained from the corresponding datasheet and user manual.
Power
 V
DD
V
is the power source for the internal voltage regulator, I/O pins, reset circuits, power
DD
management and clock circuits (see Note 2 and 3). It is supplied through the external VDD/VDDA
pin which needs to be connected to a bypass capacitor. The V
be obtained from the datasheet. The voltage generated by the internal voltage regulator (e.g. 1.5V
or 1.8V, Note 1) supplies power to the core power domain V
internal USB regulator, the internal USB regulator output can supply power to USB PHY.
Note 1: Refer to the corresponding datasheet and user manual for the actual parameter values.
Note 2: For newly released MCU types, the high speed internal oscillator is supplied by the core
Note 3: For MCU types which have a VBAT pin, refer to the V
 V
DDIO
For MCU types which have a VDDIO pin, there are a group of I/O pins that can be independently
powered. The pin assignment diagram in the datasheet can be used to obtain details about the
structure of each I/O pin. The V
the V
level to remove the need for level shifting circuits. The VDDIO pin needs to be connected to a
bypass capacitor. The operating voltage range can be obtained from the datasheet.
AN0630EN V1.00
HT32 MCU Hardware Development Guideline
power domain V
CORE.
DDIO
domain can be directly connected to external devices that are not powered by the V
DDIO
1 / 12
power operating voltage range can
DD
CORE
BAK
voltage can be different from V
. For the MCU types with an
description.
, therefore the I/O pins in
DD
DD
December 15, 2022

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Summary of Contents for Holtek HT32

  • Page 1 It introduces how to use the HT32 MCUs and describes the minimum hardware resources required for actual applications. The purpose is to assist users who are new to the HT32 MCUs to quickly implement their corresponding circuit design.
  • Page 2 HT32 MCU Hardware Development Guideline  V There is a backup power domain V in the MCU types which have a VBAT pin. The backup power domain, V , provides power to the low speed internal oscillator, LSI, low speed external crystal oscillator, LSE, power management, backup registers, etc.
  • Page 3 The power-on reset, (POR) is generated by an internal reset generator which has an internal filter to avoid erroneous operation caused by noise. The HT32 MCUs have integrated POR and PDR circuits. The reset signal is valid when the system is powered on. When V...
  • Page 4 HT32 MCU Hardware Development Guideline  nRST pin reset When the nRST pin inputs a low level, the MCU will reset most of the registers. This reset ends when the nRST pin changes from a low level to a high level. It should be noted that the RTC, PWRCU registers and backup registers will not be reset.
  • Page 5 HT32 MCU Hardware Development Guideline XTALIN XTALOUT Crystal The following guidelines are provided to improve the stability of the crystal circuit PCB layout.  The crystal oscillator should be located as close as possible to the MCU so that the trace lengths are kept as short as possible to reduce any parasitic capacitances.
  • Page 6 For more information refer to the HSI characteristics in the datasheet. However, as this accuracy may not be good enough for some applications, the HT32 MCUs provide a trimming mechanism for the HSI frequency calibration using a more accurate external reference clock.

  • Page 7: Boot Configuration

    HT32 MCU Hardware Development Guideline The LSE oscillator can be switched on or off by using the LSEEN bit in the RTC Control Register, RTCCR. The LSERDY flag in the Global Clock Status Register, GCSR, will indicate if the LSE clock is stable.

  • Page 8: Debug Management

    CoreSight™ debug port with two pins, which are clock and data pins. Pins and Debug Port Pins The number of the available pins varies with different HT32 MCU packages. Refer to the pin assignment diagram in the corresponding datasheet for more detailed information.

  • Page 9: Printed Circuit Board

    HT32 MCU Hardware Development Guideline 3. SWD pins internal pull-up and pull-down resistors If the user software has released the SWD I/O functions, the GPIO controller will take charge of these pins. These two I/O pins will then be set to the status equivalent of the reset status of the relevant GPIO control register.
  • Page 10 HT32 MCU Hardware Development Guideline to use independent power lines for V and V and place decoupling capacitors as close to the components as possible. The power lines should be close to the ground line to minimise any power loop areas. This is because power loops can actually act as an antenna, which will become a primary EMI transmitter and receiver.

  • Page 11: Reference Material

     A magnetic bead should be added between the digital power and the analog power lines for isolation purposes. Conclusion For designers who are using the HT32 MCUs for the first time, this application note can assist them to more rapidly design safe and stable hardware requiring reduced revisions. Reference Material For more information, refer to the Holtek official website: http://www.holtek.com.

  • Page 12: Limitation Of Liability

    Information displayed at such sites. Hyperlinks to other websites are at your own risk. Limitation of Liability In no event shall Holtek Limited be liable to any other party for any loss or damage whatsoever or howsoever caused directly or indirectly in connection with your access to or use of this website, the content thereon or any goods, materials or services.

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