HT32F1253 datasheet(17/35 Pages) HOLTEK

17 / 35 page

Rev. 1.00

17 of 35

May 27, 2011

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

Clock Structure

4-16 MHz

HSE XTAL

8 MHz

HSI RC

32 kHz

LSI RC

32.768 kHz

LSE OSC

WDTSRC

PLLSRC

AHB

Prescaler

1,2,4,8

FCLK

( free running clock)

HCLKC

( to Cortex-M3)

STCLK

(to SysTick)

ADC

Prescaler

1,2,4,6,8...

CK_ADC

fCK_AHB,max = 72MHz

CK_WDT

WDTEN

CK_PLL/16

CK_HSI/16

CK_HSE/16

CK_SYS/16

CKOUT

CKOUTSRC[2:0]

HSEEN

HSIEN

LSEEN

LSIEN

fCK_SYS,max = 144MHz

CK_LSI

CK_LSE

CK_AHB/16

CK_HSI

CK_HSE

PCLK

( to OPA,

AFIO

GPIO Port,

ADC,

SPI,

USART,

I2C,

GPTIM,

EXTI,

RTC,

WDT)

PLL

Clock

Monitor

PLLEN

CK_USART

CK_LSE

CK_PLL

UREN

CM3EN

(control by HW)

OPA0EN

WDTEN

(APB peripherals clock gating)

ADCEN

Prescaler

1, 2

f CK_PLL,max = 144MHz

CK_LSI

HCLKS

( to SRAM)

HCLKF

( to Flash)

CM3EN

FMCEN

CM3EN

SRAMEN

RTCSRC

CK_RTC

RTCEN

CK_AHB

000

001

010

011

100

101

110

CK_SYS

SW[1:0]

Legend: HSE = High Speed External clock

HSI = High Speed Internal clock

LSE = Low Speed External clock

LSI = Low Speed Internal clock

NOTE: 1. Control bits LSIEN & LSEEN are located at RTC Control Register (RTCCR).

2. HT32F1251B does not include the VBAT, XTAL32KIN and XTAL32KOUT pins.

Figure 3. HT32F125x Clock Structure Diagram

HT32F1253 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

HT32F1253 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc

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