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HT82R732 Arkusz danych(PDF) 21 Page - Holtek Semiconductor Inc |
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HT82R732 Arkusz danych(HTML) 21 Page - Holtek Semiconductor Inc |
21 / 74 page Oscillator Various oscillator options offer the user a wide range of functions according to their 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. System 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 functions. An external oscillator requiring some external components as well as two fully integrated internal oscillators, requiring no external components, are provided to form a range of both fast and slow system oscillators. Type Name Freq. Pins Internal High Speed RC HIRC 4MHz ¾ External Low Speed Crystal LXT 32768Hz XT1/XT2 Internal Low Speed RC LIRC 12kHz ¾ The oscillator is connected to the XT1/XT2 pins with TinyPower TM design. System Clock Configurations There are three system oscillators, one high speed oscillator and two low speed oscillators. The high speed oscillator is the internal RC oscillator -- HIRC. The two low speed oscillators are the external 32768Hz oscillator -- LXT and the internal 12kHz (VDD=5V) oscillator -- LIRC. Internal RC Oscillator - HIRC The internal RC oscillator is a fully integrated system oscillator requiring no external components. The internal RC oscillator has fixed frequency of 4MHz. Device trimming during the manufacturing process and the inclusion of internal frequency compensation circuits are used to ensure that the influence of the power supply voltage, temperature and process variations on the oscillation frequency are minimised. As a result, at a power supply of either 3V or 5V and at a temperature of 25 degrees, the fixed oscillation frequency of 4MHz will have a tolerance within 2%. HT82R732 e-Banking 8-Bit OTP MCU Rev. 1.00 21 October 31, 2013 4 M H z H I R C L I R C L X T 3 2 k H z 1 2 k H z f S Y S W a t c h d o g T i m e r L C D T i m e B a s e ¸ 4 |
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