HT32F1765 データシートの表示（PDF） - Holtek Semiconductor

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HT32F1765

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

Holtek Semiconductor 

32-bit ARM Cortex™-M3 MCU

HT32F1755/HT32F1765/HT32F2755

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 = 3.3V

4 — 16 MHz

CHSE

Recommended load capacitance on XTAL32IN

and XTAL32OUT pins

—

— TBD — pF

RFHSE

Recommended external feedback resistor

between XTAL32IN and XTAL32OUT pins

—

— 1.0 — MΩ

DHSE

HSE Oscillator Duty cycle

—

40 — 60 %

IDDHSE

HSE Oscillator Operating Current

VDD33 = 3.3V, TA = 25°C — 0.96 — mA

ISTBHSE

HSE Oscillator Standby current

VDD33 = 3.3V, TA = 25°C — — 0.1 μA

tSUHSE

HSE Oscillator Startup time

VDD33 = 3.3V, TA = 25°C — — 4 ms

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 = 3.3V

— 32.768 — kHz

CLSE

Recommended load capacitance on

XTAL32KIN and XTAL32KOUT pins

—

— TBD — pF

RFLSE

Recommended external feedback

resistor between XTAL32KIN and

XTAL32KOUT pins

—

— 10 — MΩ

DLSE

LSE Oscillator Duty cycle

—

40 — 60 %

IDDLSE

LSE Oscillator Operating Current

VDD33 = VBAT = 3.3V,

LSESM = 0 (Normal startup mode)

—

1.7

— μA

ISTBLSE LSE Oscillator Standby current

VDD33 = VBAT = 3.3V, LSESM = 1

(Fast startup mode)

—3

8 μA

tSULSE

LSE Oscillator Startup time

VDD33 = VBAT = 3.3V, LSESM = 1

(Fast startup mode)

— 200 — ms

Rev. 1.00

30 of 45

August 13, 2012

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