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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT66F13 датащи(PDF) 29 Page - Holtek Semiconductor Inc |
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HT66F13 датащи(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 173 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. OscillatorOverview 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 ExternalCrystal HXT 400kHz~20MHz OSC1/OSC2 ExternalRC ERC 8MHz OSC1 InternalHighSpeedRC HIRC 4,8or12MHz ¾ InternalLowSpeedRC LIRC 32kHz ¾ OscillatorTypes SystemClockConfigurations There are four system oscillators, three high speed oscillators and one low speed oscillator. The high speed oscillators are the external crystal/ceramic oscillator - HXT, the external - ERC, and the internal RC oscillator - HIRC. The low speed oscillator is the internal 32 kHz oscillator - LIRC. 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. Rev.1.10 29 February9,2011 HT66F13/HT66F14/HT66F15 EnhancedA/DFlashType MCU HXT High Speed Oscillator ERC HIRC LIRC Low Speed Oscillator fH 6-stage Prescaler High Speed Oscillator Configuration Option HLCLK, CKS2~CKS0 bits fH/2 fH/4 fH/8 fH/16 fH/32 fH/64 fLIRC fL fSUB Fast Wake-up from SLEEP Mode or IDLE Mode Control (for HXT only) fSYS SystemClockConfigurations |
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