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HT85F2250 数据表(PDF) 57 Page - Holtek Semiconductor Inc |
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HT85F2250 数据表(HTML) 57 Page - Holtek Semiconductor Inc |
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57 / 187 page  Rev. 1.10 �7 of 187 ���� �1� �01� A/D Flash 8051 Core Low Pin Count MCU HT85F2250/HT85F2262 OS C1 OS C2 Rf To i nt er na l ci rc ui ts In te rn al O sc illa to r Ci rc ui t C1 C2 Crystal/Resonator Oscillator – HXT Crystal Recommended Capacitor Values Crystal Oscillator C1 and C2 Values Crystal Frequency C1 C2 �4MHz 10pF 10pF �0MHz 10pF 10pF 1�MHz 10pF 10pF 8 MHz 10pF 10pF 4 MHz �0pF �0pF 400KHz �00pF �00pF Note: C1 and C� va��es are for g�idance on��. Internal High Speed RC Oscillator – HIRC The internal high speed RC oscillator is a fully integrated system oscillator requiring no external components. The internal RC oscillator has three frequencies of either 12MHz, 16MHz or 20MHz. 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. If the HIRC oscillator is used as the system oscillator, then the OSC1 and OSC2 pins should be left unconnected. Internal Low Speed RC Oscillator – LIRC The internal low speed oscillator, LIRC, is a fully self-contained free running on-chip RC oscillator, used as a clock source for the Watchdog Timer and the Time Base functions. When the microcontroller enters the IDLE Mode, the CPU clock is switched off to stop microcontroller activity and to conserve power, however the LIRC oscillator will continue to run and can maintain WDT and Time Base operation if it is selected as their clock source. The LIRC oscillator has a typical frequency of 32kHz and requires no external components, however its actual frequency may vary with temperature and supply voltage. |
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