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MC908QT4VPE Datasheet(PDF) 95 Page - Freescale Semiconductor, Inc |
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MC908QT4VPE Datasheet(HTML) 95 Page - Freescale Semiconductor, Inc |
95 / 168 page Low Power Modes MC68HC908QY/QT Family Data Sheet, Rev. 6 Freescale Semiconductor 95 again in the SIM and results in the internal bus frequency being one fourth of either the XTALCLK, RCCLK, or INTCLK frequency. 11.5 Low Power Modes The WAIT and STOP instructions put the MCU in low-power consumption standby modes. 11.5.1 Wait Mode The WAIT instruction has no effect on the oscillator logic. BUSCLKX2 and BUSCLKX4 continue to drive to the SIM module. 11.5.2 Stop Mode The STOP instruction disables either the XTALCLK, the RCCLK, or INTCLK output, hence BUSCLKX2 and BUSCLKX4. 11.6 Oscillator During Break Mode The oscillator continues to drive BUSCLKX2 and BUSCLKX4 when the device enters the break state. 11.7 CONFIG2 Options Two CONFIG2 register options affect the operation of the oscillator module: OSCOPT1 and OSCOPT0. All CONFIG2 register bits will have a default configuration. Refer to Chapter 5 Configuration Register (CONFIG) for more information on how the CONFIG2 register is used. Table 11-2 shows how the OSCOPT bits are used to select the oscillator clock source. . 11.8 Input/Output (I/O) Registers The oscillator module contains these two registers: 1. Oscillator status register (OSCSTAT) 2. Oscillator trim register (OSCTRIM) Table 11-2. Oscillator Modes OSCOPT1 OSCOPT0 Oscillator Modes 0 0 Internal oscillator 0 1 External oscillator 10 External RC 1 1 External crystal |
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