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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F23 датащи(PDF) 35 Page - Holtek Semiconductor Inc |
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HT45F23 датащи(HTML) 35 Page - Holtek Semiconductor Inc |
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35 / 152 page  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 ¾ External Clock EC 400kHz~12MHz OSC1 External Low Speed Crystal LXT 32.768kHz XT1/XT2 Internal Low Speed RC LIRC 32kHz ¾ 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 35 September 15, 2011 HXT ERC HIRC LIRC LXT 6- stage Prescaler High Speed Oscillation Low Speed Oscillation Low Speed Oscillation Configuration Option High Speed Oscillation Configuration Option fH fH/2 fH/4 fH/8 fH /16 fH /32 fH /64 fL HLCLK, CKS2~CKS0 bits Fast Wake- up from SLEEP Mode or IDLE Mode Control (for HXT only) fSYS fSUB EC System Clock Configurations |
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