HT85F2240 datasheet(52/147 Pages) HOLTEK

52 / 147 page

Rev. 1.10

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

OS C1

OS C2

To i nt er na l

ci rc ui ts

In te rn al

O sc illa to r

Ci rc ui t

Crystal/Resonator Oscillator – HXT

Crystal Recommended Capacitor Values

Crystal Oscillator C1 and C2 Values

Crystal Frequency

�4MHz

10pF

�0MHz

10pF

1�MHz

10pF

8 MHz

10pF

4 MHz

�0pF

400KHz

�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.

HT85F2240 데이터시트(PDF) 52 Page - Holtek Semiconductor Inc

HT85F2240 데이터시트(HTML) 52 Page - Holtek Semiconductor Inc

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