MC9S12D64MFU Freescale Semiconductor, MC9S12D64MFU Datasheet - Page 109

• Manufacturer Part Number: MC9S12D64MFU
• Description: IC MCU 64K FLASH 25MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12D64MFU

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: CAN, I²C, SCI, SPI
• Peripherals: PWM, WDT
• Number Of I /o: 59
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A.5.3 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.
A.5.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
The following procedure can be used to calculate the resistance and capacitance values using typical
values for K
The grey boxes show the calculation for f
for f
The VCO Gain at the desired VCO frequency is approximated by:
NOTES:
1. Depending on the crystal a damping series resistor might be necessary
2. f
3. Maximum value is for extreme cases using high Q, low frequency crystals
4. Only valid if Pierce oscillator/external clock mode is selected
osc
OSC
= 4MHz, C = 22pF.
= 4MHz and a 25MHz bus clock.
1
, f
1
and i
f
osc
K
V
ch
from Table A-16.
=
K
refdv+1
Figure A-2 Basic PLL functional diagram
1
1
e
---------------------- -
f
K
1
1
f
–
ref
VDDPLL
f
1V
VCO
vco
=
= 50MHz and f
–
100
f
cmp
C
C
p
Loop Divider
s
e
Detector
----------------------- -
Phase
60 50
synr+1
–
K
100
ref
1
–
R
MC9S12DJ64 Device User Guide — V01.20
= 1MHz. E.g., these frequencies are used
= -90.48MHz/V
XFC Pin
1
2
VCO
K
V
f
vco
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