HT45F43 datasheet(35/152 Pages) HOLTEK

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Oscillator

Various oscillator options offer the user a wide range of functions according to their various

application requirements. The flexible features of the oscillator functions ensure that the best

optimisation can be achieved in terms of speed and power saving. Oscillator selections and operation

are selected through a combination of configuration options and registers.

Oscillator Overview

In addition to being the source of the main system clock the oscillators also provide clock sources for

the Watchdog Timer and Time Base Interrupts. External oscillators requiring some external

components as well as fully integrated internal oscillators, requiring no external components, are

provided to form a wide range of both fast and slow system oscillators. All oscillator options are

selected through the configuration options. The higher frequency oscillators provide higher

performance but carry with it the disadvantage of higher power requirements, while the opposite is of

course true for the lower frequency oscillators. With the capability of dynamically switching between

fast and slow system clock, the device has the flexibility to optimize the performance/power ratio, a

feature especially important in power sensitive portable applications.

Type

Name

Freq.

Pins

External Crystal

HXT

400kHz~12MHz

OSC1/OSC2

External RC

ERC

4MHz

OSC1

Internal High Speed RC

HIRC

910kHz, 2/4/8MHz

External Clock

400kHz~12MHz

OSC1

External Low Speed Crystal

LXT

32.768kHz

XT1/XT2

Internal Low Speed RC

LIRC

32kHz

Oscillator Types

System Clock Configurations

There are six methods of generating the system clock, four high speed oscillators and two low speed

oscillators. The high speed oscillators are the external crystal/ ceramic oscillator, external RC network

oscillator, external clock and the internal 910kHz, 2MHz, 4MHz or 8MHz RC oscillator. The two low

speed oscillators are the internal 32kHz RC oscillator and the external 32.768kHz crystal oscillator.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

HXT

ERC

HIRC

LIRC

LXT

6- stage Prescaler

High Speed Oscillation

Low Speed Oscillation

Configuration Option

High Speed Oscillation

Configuration Option

fH/2

fH/4

fH/8

fH /16

fH /32

fH /64

HLCLK,

CKS2~CKS0 bits

Fast Wake-

up from SLEEP Mode or

IDLE Mode Control (for HXT only)

fSYS

fSUB

System Clock Configurations

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