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Z8F082ASH020SC bảng dữ liệu(PDF) 178 Page - Zilog, Inc. |
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Z8F082ASH020SC bảng dữ liệu(HTML) 178 Page - Zilog, Inc. |
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178 / 244 page ![]() PS024705-0405 P R E L I M I N A R Y Oscillator Control Z8 Encore! XP® F08xA Series Product Specification 160 Oscillator Control Overview The Z8 Encore! XP® F08xA Series devices uses five possible clocking schemes, each user-selectable: • On-chip precision trimmed RC oscillator • On-chip oscillator using off-chip crystal or resonator • On-chip oscillator using external RC network • External clock drive • On-chip low precision Watch-Dog Timer oscillator In addition, Z8 Encore! XP® F08xA Series devices contain clock failure detection and recovery circuitry, allowing continued operation despite a failure of the primary oscillator. Operation This chapter discusses the logic used to select the system clock and handle primary oscil- lator failures. A description of the specific operation of each oscillator is outlined else- where in this document. The detailed description of the Watch-Dog Timer Oscillator starts on page 79, the Internal Precision Oscillator description begins on page 169, and the chap- ter outlining the Crystal Oscillator begins on page 165 of this document. System Clock Selection The oscillator control block selects from the available clocks. Table 101 details each clock source and its usage. |
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