HT67F60 datasheet(53/242 Pages) HOLTEK

53 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

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~20MHz

OSC1/OSC2

External RC

ERC

8MHz

OSC1

External Clock

400kHz~20MHz

OSC1

Internal High Speed RC

HIRC

4, 8 or 12MHz

—

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, three 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 4MHz, 8MHz or 12MHz RC oscillator. The two

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

oscillator. Selecting whether the low or high speed oscillator is used as the system oscillator is

implemented using the HLCLK bit and CKS2 ~ CKS0 bits in the SMOD register and as the system

clock can be dynamically selected.

HT67F60 Datasheet(PDF) 53 Page - Holtek Semiconductor Inc

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