HT32F1252 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT32F1252

Holtek 32-bit Microcontroller with ARM®Cortex™-M3 Core

Holtek Semiconductor 

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

Clock Structure

8 MHz

HSI RC

HSIEN

4-16 MHz

HSE XTAL

HSEEN

PLLSRC

PLLEN

f CK_PLL,max = 144MHz

1

PLL CK_PLL

0

SW[1:0]

CK_HSI

CK_HSE

fCK_SYS,max = 144MHz

0x

CK_SYS

11

AHB

Prescaler

÷ 1,2,4,8

10

Prescaler

÷1, 2

UREN

÷8

fCK_AHB,max = 72MHz

CK_AHB

CK_USART

STCLK

(to SysTick)

FCLK

( free running clock)

32.768 kHz CK_LSE

LSE OSC

Clock

Monitor

WDTSRC

LSEEN

32 kHz CK_LSI

LSI RC

LSIEN

CKOUTSRC[2:0]

000

001

010

CKOUT

011

100

101

110

1

CK_WDT

0

WDTEN

RTCSRC

1

CK_RTC

0

RTCEN

CK_PLL/16

CK_AHB/16

CK_SYS/16

CK_HSE/16

CK_HSI/16

CK_LSE

CK_LSI

CM3EN

(control by HW)

CM3EN

FMCEN

CM3EN

SRAMEN

14

OPA0EN

14

WDTEN

(APB peripherals clock gating)

ADC

Prescaler

÷ 1,2,4,6,8...

ADCEN

HCLKC

( to Cortex-M3)

HCLKF

( to Flash)

HCLKS

( to SRAM)

PCLK

( to OPA,

AFIO

GPIO Port,

ADC,

SPI,

USART,

I2C,

GPTIM,

EXTI,

RTC,

WDT)

CK_ADC

Legend: HSE = High Speed External clock

HSI = High Speed Internal clock

LSE = Low Speed External clock

LSI = Low Speed Internal clock

NOTES: 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

Rev. 1.10

17 of 35

April 13, 2012

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