HT32F1253 datasheet(24/35 Pages) HOLTEK

24 / 35 page

Rev. 1.00

24 of 35

May 27, 2011

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

External Clock Characteristics

Table 8. High Speed External Clock (HSE) Characteristics

TA = 25°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE

High Speed External oscillator

frequency (HSE)

VDD33 = 3.3 V

—

MHz

CHSE

Recommended load capacitance on

XTALIN and XTALOUT

—

TBD

—

RFHSE

Recommended external feedback

resistor between XTALIN and

XTALOUT

—

1.0

—

MΩ

DHSE

HSE Oscillator Duty cycle

—

IDDHSE

HSE Oscillator Operating Current

VDD33 = 3.3 V, TA = 25°C

—

0.96

—

ISTBHSE

HSE Oscillator Standby current

VDD33 = 3.3 V, TA = 25°C

—

0.1

μA

tSUHSE

HSE Oscillator Startup time

VDD33 = 3.3 V, TA = 25°C

—

Table 9. Low Speed External Clock (LSE) Characteristics

TA = 25°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE

Low Speed External oscillator

frequency (LSE)

VDD33 = VBAT = 3.3 V

—

32.768

—

kHz

CLSE

Recommended load capacitance on

XTAL32IN and XTAL32OUT

—

TBD

—

RFLSE

Recommended external feedback

resistor between XTAL32IN and

XTAL32OUT

—

MΩ

DLSE

LSE Oscillator Duty cycle

—

IDDLSE

LSE Oscillator Operating Current

VDD33 = VBAT = 3.3 V,

LSESM = 0 (Normal

startup mode)

—

1.7

—

μA

ISTBLSE

LSE Oscillator Standby current

VDD33 = VBAT = 3.3 V,

LSESM = 1 (Fast startup

mode)

—

μA

tSULSE

LSE Oscillator Startup time

VDD33 = VBAT = 3.3 V,

LSESM = 1 (Fast startup

mode)

—

200

—

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