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HC705JJ7GRS/D 数据表(PDF) 26 Page - NXP Semiconductors |
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HC705JJ7GRS/D 数据表(HTML) 26 Page - NXP Semiconductors |
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26 / 230 page  General Description General Release Specification MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Description Figure 1-3. EPO Oscillator Connections 1.7.1 Crystal Oscillator The circuit in Figure 1-3 (a) shows a typical oscillator circuit for an AT- cut, parallel resonant crystal. The crystal manufacturer’s recommendations should be followed, as the crystal parameters determine the external component values required to provide maximum stability and reliable startup. The load capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal and components should be mounted as close as possible to the pins for startup stabilization and to minimize output distortion. An internal startup resistor of approximately 2 M Ω can be provided between OSC1 and OSC2 for the crystal type oscillator by use of the OSCRES bit in the MOR. NOTE: In general, a 32-kHz crystal is not recommended for use with the MC68HC705JJ7/MC68HC705JP7 unless specifically indicated by the crystal manufacturer. 1.7.2 Ceramic Resonator Oscillator In cost-sensitive applications, a ceramic resonator can be used in place of the crystal. The circuit in Figure 1-3 (a) can be used for a ceramic resonator. The resonator manufacturer’s recommendations should be followed, as the resonator parameters determine the external component values required for maximum stability and reliable starting. MCU (a) Crystal or Ceramic Resonator Connections OSC1 OSC2 2 M Ω R UNCONNECTED EXTERNAL CLOCK (b) RC Oscillator Connections (c) External Clock Source Connection OSC1 OSC2 MCU OSC1 OSC2 MCU Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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