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DSP56F801-7UM Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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DSP56F801-7UM Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 52 page  Clock and Phase Locked Loop Signals 56F803 Technical Data, Rev. 15 Freescale Semiconductor 11 2.3 Clock and Phase Locked Loop Signals 2.4 Address, Data, and Bus Control Signals Table 2-5 PLL and Clock No. of Pins Signal Name Signal Type State During Reset Signal Description 1 EXTAL Input Input External Crystal Oscillator Input—This input should be connected to an 8MHz external crystal or ceramic resonator. For more information, please refer to Section 3.5. 1 XTAL Input/ Output Chip-driven Crystal Oscillator Output—This output should be connected to an 8MHz external crystal or ceramic resonator. For more information, please refer to Section 3.5. This pin can also be connected to an external clock source. For more information, please refer to Section 3.5.3. 1 CLKO Output Chip-driven Clock Output—This pin outputs a buffered clock signal. By programming the CLKOSEL[4:0] bits in 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’s master clock at the output of the PLL. The clock frequency on this pin can also be disabled by programming the CLKOSEL[4:0] bits in CLKOSR. Table 2-6 Address Bus Signals No. of Pins Signal Name Signal Type State During Reset Signal Description 6 A0–A5 Output Tri-stated Address Bus—A0–A5 specify the address for external Program or Data memory accesses. 2 A6–A7 GPIOE2– GPIOE3 Output Input/O utput Tri-stated Input Address Bus—A6–A7 specify the address for external Program or Data memory accesses. Port E GPIO—These two pins are General Purpose I/O (GPIO) pins that can be individually programmed as input or output pins. After reset, the default state is Address Bus. 8 A8–A15 GPIOA0– GPIOA7 Output Input/O utput Tri-stated Input Address Bus—A8–A15 specify the address for external Program or Data memory accesses. Port A GPIO—These eight pins are General Purpose I/O (GPIO) pins that can be individually programmed as input or output pins. After reset, the default state is Address Bus. |
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