HT32F1253_12 datasheet(25/35 Pages) HOLTEK

25 / 35 page

Rev. 1.10

�5 of �5

��i� 1�� 01�

��-bit �RM Co�tex™-M� MCU

HT��F1�51/51B/5�/5�

Internal Clock Characteristics

Table 10. High Speed Internal Clock (HSI) Characteristics

T� = �5°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

High S�eed Inte�na� Osci��ato�

F�equency (HSI )

VDD�� = �.�V�

T� = -40°C ~ +85°C

TBD

MHz

�CCHSI

HSI Osci��ato� F�equency

accu�acy

Facto�y-t�immed�

VDD�� = �.�V� T� = �5°C

-1

—

DHSI

HSI Osci��ato� Duty cyc�e

VDD�� = �.�V� fHSI = 8MHz

�5

—

IDDHSI

HSI Osci��ato� O�e�ating

Cu��ent

VDD�� = �.�V� fHSI = 8MHz

—

0.9�

—

m�

tSUHSI

HSI Osci��ato� Sta�tu� time

VDD�� = �.�V� fHSI = 8MHz�

HSIRCBL = 0 (HSI Ready

Counte� Bits Length 7 Bits )

—

μs

NOTE: HSIRCBL field is in PWRCU HSIRCR register

Table 11. Low Speed Internal Clock (LSI) Characteristics

T� = �5°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSI

Low S�eed Inte�na� Osci��ato�

F�equency(LSI)

VDD�� = VB�T = �.�V�

T� = -40°C ~ +85°C

�5

��

4�

kHz

IDDLSI

LSI Osci��ato� O�e�ating

Cu��ent

VDD�� = VB�T = �.�V�

T� = �5°C

—

1.0

�

μA

tSULSI

LSI Osci��ato� Sta�tu� time

VDD�� = VB�T = �.�V�

T� = �5°C

—

�5

—

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