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MC908QY2ACPE Datasheet(PDF) 101 Page - Freescale Semiconductor, Inc |
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MC908QY2ACPE Datasheet(HTML) 101 Page - Freescale Semiconductor, Inc |
101 / 200 page Registers MC68HC908QYA/QTA Family Data Sheet, Rev. 3 Freescale Semiconductor 101 ECFS1:ECFS0 — External Crystal Frequency Select Bits These read/write bits enable the specific amplifier for the crystal frequency range. Refer to oscillator characteristics table in the Electricals section for information on maximum external clock frequency versus supply voltage. ECGON — External Clock Generator On Bit This read/write bit enables the OSC1 pin as the clock input to the MCU, so that the switching process can be initiated. This bit is cleared by reset. This bit is ignored in monitor mode with the internal oscillator bypassed. 1 = External clock enabled 0 = External clock disabled ECGST — External Clock Status Bit This read-only bit indicates whether an external clock source is engaged to drive the system clock. 1 = An external clock source engaged 0 = An external clock source disengaged 11.8.2 Oscillator Trim Register (OSCTRIM) TRIM7–TRIM0 — Internal Oscillator Trim Factor Bits These read/write bits change the internal capacitance used by the internal oscillator. By measuring the period of the internal clock and adjusting this factor accordingly, the frequency of the internal clock can be fine tuned. Increasing (decreasing) this factor by one increases (decreases) the period by approximately 0.2% of the untrimmed oscillator period. The oscillator period is based on the oscillator frequency selected by the ICFS bits in OSCSC. Applications using the internal oscillator should copy the internal oscillator trim value at location $FFC0 or $FFC1 into this register to trim the clock source. ECFS1 ECFS0 External Crystal Frequency 0 0 8 MHz – 32 MHz 0 1 1 MHz – 8 MHz 1 0 32 kHz – 100 kHz 11 Reserved Bit 7 654321 Bit 0 Read: TRIM7 TRIM6 TRIM5 TRIM4 TRIM3 TRIM2 TRIM1 TRIM0 Write: Reset: 10000000 Figure 11-5. Oscillator Trim Register (OSCTRIM) |
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