DSP56F826 datasheet(11/60 Pages) FREESCALE

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Signals and Package Information

56F827 Technical Data, Rev. 12

Freescale Semiconductor

VPP

Input

VPP—This pin should be left unconnected as an open circuit for normal

functionality.

EXTAL

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)

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

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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