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HCS08 bảng dữ liệu(PDF) 149 Page - NXP Semiconductors |
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HCS08 bảng dữ liệu(HTML) 149 Page - NXP Semiconductors |
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149 / 316 page ![]() Internal Clock Source (S08ICSV2) MC9S08SG8 MCU Series Data Sheet, Rev. 8 Freescale Semiconductor 149 10.1.2 Features Key features of the ICS module follow. For device specific information, refer to the ICS Characteristics in the Electricals section of the documentation. • Frequency-locked loop (FLL) is trimmable for accuracy — 0.2% resolution using internal 32kHz reference — 1.5% deviation over voltage and temperature using internal 32kHz reference • Internal or external reference clocks up to 5MHz can be used to control the FLL — 3 bit select for reference divider is provided • Internal reference clock has 9 trim bits available • Internal or external reference clocks can be selected as the clock source for the MCU • Whichever clock is selected as the source can be divided down — 2 bit select for clock divider is provided – Allowable dividers are: 1, 2, 4, 8 – BDC clock is provided as a constant divide by 2 of the DCO output • Control signals for a low power oscillator as the external reference clock are provided — HGO, RANGE, EREFS, ERCLKEN, EREFSTEN • FLL Engaged Internal mode is automatically selected out of reset 10.1.3 Block Diagram Figure 10-2 is the ICS block diagram. |
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