MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 165

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

7.4.6
In PLL mode, the PLL synthesizes the system clocks. The PLL can multiply the reference clock
frequency by 4x to 18x, provided that the system clock frequency remains within the range listed
in the electrical specifications. For example, if the reference frequency is 8 MHz, the PLL can
synthesize frequencies of 32 MHz to 144 MHz. In addition, the RFD can reduce the system
frequency by dividing the output of the PLL. The RFD is not in the feedback loop of the PLL, so
changing the RFD divisor does not affect PLL operation. Finally, the PLL can be frequency
modulated to reduce electromagnetic interference often associated with clock circuitry.
Figure 7-9
values. Actual component values depend on crystal specifications.
The following subsections describe each major block of the PLL. Refer to
these functional sub-blocks interact.
Freescale Semiconductor
PLL Operation
shows the external support circuitry for the crystal oscillator with example component
VSSPLL
C1
ON-CHIP
Figure 7-9. Crystal Oscillator Example
EXTAL
MCF5235 Reference Manual, Rev. 2
RF
XTAL
RS
VSSPLL
C2
8-MHz Crystal Configuration
C1 = C2 = 16 pF
RF ≥ 1 MΩ
RS = 470 Ω
Figure 7-10
Functional Description
to see how
7-21