HT32F1253_12 datasheet(17/35 Pages) HOLTEK

17 / 35 page

Rev. 1.10

17 of �5

��i� 1�� 01�

��-bit �RM Co�tex™-M� MCU

HT��F1�51/51B/5�/5�

Clock Structure

4-16 MHz

HSE XT�L

8 MHz

HSI RC

�� kHz

LSI RC

��.768 kHz

LSE OSC

WDTSRC

PLLSRC

�HB

P�esca�e�

1��4�8

FCLK

( f�ee �unning c�ock)

HCLKC

( to Co�tex-M�)

STCLK

(to SysTick)

�DC

P�esca�e�

1��4�6�8...

CK_�DC

fCK_AHB,max = 72MHz

CK_WDT

WDTEN

CK_PLL/16

CK_HSI/16

CK_HSE/16

CK_SYS/16

CKOUT

CKOUTSRC[�:0]

HSEEN

HSIEN

LSEEN

LSIEN

fCK_SYS,max = 144MHz

CK_LSI

CK_LSE

CK_�HB/16

CK_HSI

CK_HSE

PCLK

( to OP��

�FIO

GPIO Po�t�

�DC�

SPI�

US�RT�

I�C�

GPTIM�

EXTI�

RTC�

WDT)

PLL

C�ock

Monito�

PLLEN

CK_US�RT

CK_LSE

CK_PLL

UREN

CM�EN

(cont�o� by HW)

OP�0EN

WDTEN

(�PB �e�i�he�a�s c�ock gating)

�DCEN

P�esca�e�

1� �

f CK_PLL,max = 144MHz

CK_LSI

HCLKS

( to SR�M)

HCLKF

( to F�ash)

CM�EN

FMCEN

CM�EN

SR�MEN

RTCSRC

CK_RTC

RTCEN

CK_�HB

000

001

010

011

100

101

110

CK_SYS

SW[1:0]

Legend: HSE = High S�eed Exte�na� c�ock

HSI = High S�eed Inte�na� c�ock

LSE = Low S�eed Exte�na� c�ock

LSI = Low S�eed Inte�na� c�ock

NOTES: 1. Cont�o� bits LSIEN & LSEEN a�e �ocated at RTC Cont�o� Registe� (RTCCR).

2. HT��F1�51B does not inc�ude the VB�T� XT�L��KIN and XT�L��KOUT �ins.

Figure 3. HT32F125x Clock Structure Diagram

HT32F1253 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

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