DSP56F827FG80 Просмотр технического описания (PDF) - Motorola => Freescale

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DSP56F827FG80

16-bit Hybrid Controller

Motorola => Freescale 

Freescale Semiconductor, Inc.

Table 3. 56F827 Signal and Package Information for the 128 Pin LQFP (Continued)

Signal Name Pin No.

VPP

90

EXTAL

59

XTAL

60

(CLOCKIN)

CLKO

57

Type

Input

Input

Output

Input

Output

Description

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

functionality.

ExternalCrystal 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.

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.

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).

8

56F827 Technical Data

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