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MC908QY2AMDWE Datasheet(PDF) 100 Page - Freescale Semiconductor, Inc |
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MC908QY2AMDWE Datasheet(HTML) 100 Page - Freescale Semiconductor, Inc |
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100 / 200 page  Oscillator (OSC) Module MC68HC908QYA/QTA Family Data Sheet, Rev. 2 100 Freescale Semiconductor 11.8 Registers The oscillator module contains two registers: • Oscillator status and control register (OSCSC) • Oscillator trim register (OSCTRIM) 11.8.1 Oscillator Status and Control Register The oscillator status and control register (OSCSC) contains the bits for switching between internal and external clock sources. If the application uses an external crystal, bits in this register are used to select the crystal oscillator amplifier necessary for the desired crystal. While running off the internal clock source, the user can use bits in this register to select the internal clock source frequency. OSCOPT1:OSCOPT0 — OSC Option Bits These read/write bits allow the user to change the clock source for the MCU. The default reset condition has the bus clock being derived from the internal oscillator. See 11.3.2.2 Internal to External Clock Switching for information on changing clock sources. ICFS1:ICFS0 — Internal Clock Frequency Select Bits These read/write bits enable the frequency to be increased for applications requiring a faster bus clock when running off the internal oscillator. The WAIT instruction has no effect on the oscillator logic. BUSCLKX2 and BUSCLKX4 continue to drive to the SIM module. Bit 7 6 54321 Bit 0 Read: OSCOPT1 OSCOPT0 ICFS1 ICFS0 ECFS1 ECFS0 ECGON ECGST Write: Reset: 0 0 100000 = Unimplemented Figure 11-4. Oscillator Status and Control Register (OSCSC) OSCOPT1 OSCOPT0 Oscillator Modes 0 0 Internal oscillator (frequency selected using ICFSx bits) 0 1 External oscillator clock 10 External RC 1 1 External crystal (range selected using ECFSx bits) ICFS1 ICFS0 Internal Clock Frequency 0 0 4.0 MHz 0 1 8.0 MHz 1 0 12.8 MHz — default reset condition 11 Reserved |
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