HT32F22366 datasheet(8/56 Pages) HOLTEK

8 / 56 page

Rev. 1.00

8 of 56

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Reset Control Unit – RSTCU

▆

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

SWJ-DP controller. The resets can be triggered by an external signal, internal events and the reset

generators.

Clock Control Unit – CKCU

▆

External 4 to 16 MHz crystal oscillator

▆

External 32.768 kHz crystal oscillator

▆

Internal 8 MHz RC oscillator trimmed to ±2% accuracy at 3.3 V operating voltage and 25°C

operating temperature

▆

Internal 32 kHz RC oscillator

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Integrated system clock PLL

▆

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 prescalers, clock multiplexers, APB clock divider

and gating circuitry. The clocks of the AHB, APB and Cortex®-M3 are derived from the system

clock (CK_SYS) which can come from the LSI, LSE, HSI, HSE or PLL. The Watchdog Timer and

Real Time Clock (RTC) use either the LSI or LSE as their clock source. The maximum operating

frequency of the system core clock (CK_AHB) can be up to 96 MHz.

Power Management – PWRCU

▆

Single VDD power supply: 2.0 V to 3.6 V

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Integrated 1.5 V LDO regulator for CPU core, peripherals and memories power supply

▆

VBAT battery power supply for RTC and backup registers

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Three power domains: VDD, 1.5V and Backup

▆

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.

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