32-Bit Arm® Cortex®-M0+ MCU
HT32F52344/HT32F52354
Reset Control Unit – RSTCU
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Supply supervisor:
● Power on Reset / Power down Reset – POR / PDR
● Brown-out Detector – BOD
● Programmable Low Voltage Detector – LVD
The Reset Control Unit, RSTCU, has three kinds of reset, a power on reset, a system reset and an
APB unit reset. The power on reset, known as a cold reset, resets the full system during power up.
A system reset resets the processor core and peripheral IP components with the exception of the
SW-DP controller. The resets can be triggered by external signals, internal events and the reset
generators.
Clock Control Unit – CKCU
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External 4 to 16 MHz crystal oscillator
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External 32.768 kHz crystal oscillator
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Internal 8 MHz RC oscillator trimmed to ±2 % accuracy at 3.3 V operating voltage and 25 °C
operating temperature
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Internal 32 kHz RC oscillator
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Integrated clock PLL and USB PLL
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Independent clock divider and gating bits for peripheral clock sources
The Clock Control Unit, CKCU, provides a range of oscillator and clock functions. These include
a High Speed Internal RC oscillator (HSI), a High Speed External crystal oscillator (HSE), a Low
Speed Internal RC oscillator (LSI), a Low Speed External crystal oscillator (LSE), a Phase Lock
Loop (PLL), a HSE clock monitor, clock pre-scalers, clock multiplexers, APB clock divider and gating
circuitry. The AHB, APB and Cortex®-M0+ clocks are derived from the system clock (CK_SYS)
which can come from the HSI, HSE, LSI, LSE or system PLL. The Watchdog Timer and Real Time
Clock (RTC) use either the LSI or LSE as their clock source.
Power Management Control Unit – PWRCU
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Single VDD power supply: 1.65 V to 3.6 V
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Integrated 1.5 V LDO regulator for CPU core, peripherals and memories power supply
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VDD power supply for RTC
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Two power domains: VDD, 1.5 V
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Four power saving modes: Sleep, Deep-Sleep1, Deep-Sleep2, Power-Down
Power consumption can be regarded as one of the most important issues for many embedded
system applications. Accordingly the Power Control Unit, PWRCU, in these devices provides many
types of power saving modes such as Sleep, Deep-Sleep1, Deep-Sleep2 and Power-Down mode.
These operating modes reduce the power consumption and allow the application to achieve the best
trade-off between the conflicting demands of CPU operating time, speed and power consumption.
Rev. 1.10
8 of 51
August 03, 2020