XC2000 datasheet(91/110 Pages) INFINEON

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XC2287 / XC2286 / XC2285

XC2000 Family Derivatives

Electrical Parameters

Preliminary

Data Sheet

V0.91, 2007-02

Draft Version

The timing listed in the AC Characteristics refers to TCSs. Therefore, the timing must be

calculated using the minimum TCS possible under the respective circumstances.

The actual minimum value for TCS depends on the jitter of the PLL. As the PLL is

constantly adjusting its output frequency so it corresponds to the applied input frequency

(crystal or oscillator), the accumulated jitter is limited, which means that the relative

deviation for periods of more than one TCS is lower than for one single TCS.

This is especially important for bus cycles using waitstates and e.g. for the operation of

timers, serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train

generation or measurement, lower baudrates, etc.) the deviation caused by the PLL jitter

is, therefore, negligible.

The value of the accumulated PLL jitter depends on the number of consecutive VCO

output cycles within the respective timeframe. The VCO output clock is divided by the

output prescaler (K2+1) to generate the system clock signal

SYS. Therefore, the number

of VCO cycles can be represented as (K2+1)

× T, where T is the number of consecutive

SYS cycles (TCS).

Different frequency bands can be selected for the VCO, so the operation of the PLL can

be adjusted to a wide range of input and output frequencies:

Wakeup Oscillator

When wakeup oscillator operation is configured (SYSCON0.CLKSEL = 00

B), the system

clock is derived from the low-frequency wakeup oscillator:

SYS = fWU.

In this mode, a basic functionality can be maintained without requiring an external clock

source and while minimizing the power consumption.

Table 17

VCO Bands for PLL Operation

1) Not subject to production test - verified by design/characterization.

PLLCON0.VCOSEL VCO Frequency Range

Base Frequency Range

40 … 120 MHz

10 … 40 MHz

90 … 160 MHz

20 … 80 MHz

Reserved

XC2000 Datasheet(PDF) 91 Page - Infineon Technologies AG

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