DSP56309D View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56309D

24-Bit Digital Signal Processor

Motorola => Freescale 

Clock

Freescale Semiconductor, Inc.

1.4 Clock

1.5 PLL

Table 1-4. Clock Signals

Signal

Name

EXTAL

XTAL

Type

Input

Output

State

During

Reset

Input

Chip-driven

Signal Description

External Clock/Crystal Input—Interfaces the internal crystal oscillator

input to an external crystal or an external clock.

Crystal Output—Connects the internal crystal oscillator output to an

external crystal. If an external clock is used, leave XTAL unconnected.

Signal

Name

CLKOUT

PCAP

PINIT

NMI

Type

Output

Input

Input

Input

Table 1-5. Phase-Locked Loop Signals

State During

Reset

Chip-driven

Signal Description

Clock Output—Provides an output clock synchronized to the

internal core clock phase.

If the PLL is enabled and both the multiplication and division

factors equal one, then CLKOUT is also synchronized to EXTAL.

Input

Input

If the PLL is disabled, the CLKOUT frequency is half the

frequency of EXTAL.

PLL Capacitor—An input connecting an off-chip capacitor to the

PLL filter. Connect one capacitor terminal to PCAP and the other

terminal to VCCP.

If the PLL is not used, PCAP can be tied to VCC, GND, or left

floating.

PLL Initial—During assertion of RESET, the value of PINIT is

written into the PLL enable (PEN) bit of the PLL control (PCTL)

register, determining whether the PLL is enabled or disabled.

Nonmaskable Interrupt—After RESET deassertion and during

normal instruction processing, this Schmitt-trigger input is the

negative-edge-triggered NMI request internally synchronized to

CLKOUT.

Note: PINIT/NMI can tolerate 5 V.

1-4

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