HT32F52230 datasheet(18/39 Pages) HOLTEK

18 / 39 page

Rev. 1.21

18 of 39

April 11, 2017

32-Bit ARM® Cortex™-M0+ MCU

HT32F52220/HT32F52230

Clock Structure

4-16 MHz

HSE XTAL

8 MHz

HSI RC

32 kHz

LSI RC

Legend:

HSE = High Speed External clock

HSI = High Speed Internal clock

LSI = Low Speed Internal clock

WDTSRC

PLLSRC

AHB Prescaler

1,2,4,8,16,32

FCLK

( Free running clock)

STCLK

(to SysTick)

CK_ADC IP

CK_WDT

WDTEN

CK_REF

CK_HSI/16

CK_HSE/16

CK_SYS/16

CKOUT

CKOUTSRC[2:0]

HSEEN

HSIEN

LSIEN

fCK_SYS,max = 40 MHz

CK_LSI

Reserved

CK_AHB/16

CK_HSI

CK_HSE

PCLK ( AFIO, ADC,

SPI, USART, UART,

I2C, GPTM, SCTMx,

BFTM, EXTI, WDT)

PLL

Clock

Monitor

PLLEN

CK_PLL

ADCEN

f CK_PLL,max = 40 MHz (Recommended)

CK_LSI

HCLKS

( to SRAM)

HCLKF

( to Flash)

CM0PEN

FMCEN

SRAMEN

000

001

010

011

100

101

110

CK_SYS

SW[2:0]

00x

011

010

111

110

HCLKC

( to CortexTM-M0+)

CM0PEN

(control by HW)

Prescaler

1 ~ 32

CK_REF

Divider

CKREFPRE

HCLKBM

( to Bus Matrix)

BMEN

HCLKAPB

( to APB Bridge)

APBEN

Peripherals

Clock

Prescaler

1,2,4,8

ADC

Prescaler

1,2,3,4,8...

PCLK

PCLK/2

PCLK/4

PCLK/8

SPIEN

EXTIEN

CK_GPIO

( to GPIO port)

GPIOBEN

GPIOAEN

CKREFEN

CM0PEN

Reserved

Figure 3 Clock Structure

HT32F52230 Datasheet(PDF) 18 Page - Holtek Semiconductor Inc

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