MC9S12DG128VPV Freescale Semiconductor, MC9S12DG128VPV Datasheet - Page 109

• Manufacturer Part Number: MC9S12DG128VPV
• Description: IC MCU 128K FLASH 25MHZ 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12DG128VPV

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: CAN, I²C, SCI, SPI
• Peripherals: PWM, WDT
• Number Of I /o: 91
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 112-LQFP
• 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:
The phase detector relationship is given by:
i
ch
is the current in tracking mode.
OSC
= 4MHz and a 25MHz bus clock.
1
, f
1
and i
f
osc
K
V
ch
from Table A-16.
=
K
refdv+1
K
Figure A-2 Basic PLL functional diagram
Freescale Semiconductor, Inc.
1
=
1
For More Information On This Product,
e
–
---------------------- -
f
K
i
1
ch
1
f
–
ref
VDDPLL
Go to: www.freescale.com
f
1V
VCO
vco
K
=
V
= 50MHz and f
–
120
f
cmp
C
C
p
Loop Divider
e
s
Detector
= 341.0Hz/
----------------------- -
Phase
75 50
synr+1
–
K
MC9S12DT128B Device User Guide — V01.09
120
ref
1
–
R
= 1MHz. E.g., these frequencies are used
= -97.43MHz/V
XFC Pin
1
2
VCO
K
V
f
vco