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MC68HC908AP16CFB Datasheet(PDF) 91 Page - Motorola, Inc |
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MC68HC908AP16CFB Datasheet(HTML) 91 Page - Motorola, Inc |
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91 / 440 page  MC68HC908AP Family — Rev. 2.5 Data Sheet MOTOROLA 91 Data Sheet – MC68HC908AP Family Section 7. Oscillator (OSC) 7.1 Introduction The oscillator module consist of three types of oscillator circuits: • Internal oscillator • RC oscillator • 32.768kHz crystal (x-tal) oscillator The reference clock for the CGM and other MCU sub-systems is selected by programming the mask option register located at $FFCF. The reference clock for the timebase module (TBM) is selected by the two bits, OSCCLK1 and OSCCLK0, in the CONFIG2 register. The internal oscillator runs continuously after a POR or reset, and is always available. The RC and crystal oscillator cannot run concurrently; one is disabled while the other is selected; because the RC and x-tal circuits share the same OSC1 pin. NOTE: The oscillator circuits are powered by the on-chip VREG regulator, therefore, the output swing on OSC1 and OSC2 is from VSS to VREG. Figure 7-1. shows the block diagram of the oscillator module. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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