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56800E Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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56800E Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 60 page  Signals and Package Information 56F827 Technical Data, Rev. 12 Freescale Semiconductor 11 VPP 90 Input VPP—This pin should be left unconnected as an open circuit for normal functionality. EXTAL 59 Input External Crystal Oscillator Input—This input should be connected to a 4MHz external crystal or ceramic resonator. For more information, please refer to Section 3.6. This pin can also be connected to an external clock source. For more information, please refer to Section 3.6.3. XTAL (CLOCKIN) 60 Output Input Crystal Oscillator Output—This output connects the internal crystal oscillator output to an external crystal or ceramic resonator. If an external clock source over 4MHz is used, XTAL must be used as the input and EXTAL connected to VSS. For more information, please refer to Section 3.6.3. External Clock Input—This input should be used when using an external clock or ceramic resonator. CLKO 57 Output Clock Output—This pin outputs a buffered clock signal. By programming the CLKO Select Register (CLKOSR), the user can select between outputting a version of the signal applied to XTAL and a version of the device master clock at the output of the PLL. The clock frequency on this pin can be disabled by programming the CLKO Select Register (CLKOSR). Table 2-2 56F827 Signal and Package Information for the 128 Pin LQFP (Continued) Signal Name Pin No. Type Description |
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