MC9S12T64 Datasheet, PDF (581/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Electrical Characteristics
Reset, Oscillator and PLL Characteristics
Phase Locked
Loop
The oscillator provides the reference clock for the PLL. The PLL´s
Voltage Controlled Oscillator (VCO) is also the system clock source in
self clock mode.
XFC Component
Selection
This section describes the selection of the XFC components to achieve
a good filter characteristics.
Motorola suggest the use of the following values R= 2.2 KΩ, Cs=33 nF,
and Cp = 3.3 nF when f_REF = 4MHz, f_BUS = 16MHz, f_VCO = 32MHz,
REFDV = #$00, and SYNR = #$03. See Figure 111. These values are
preliminary and should be used as a guide only. Values cannot be
guaranteed by Motorola and are subject to change without notice.
MCU
XFC
VDDPLL
C_S
C_P
R_S
Figure 111 PLL Loop Filter Connections
MOTOROLA
Electrical Characteristics
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MC9S12T64Revision 1.1.1
581