MC9S12E128CFU Freescale Semiconductor, MC9S12E128CFU Datasheet - Page 578

• Manufacturer Part Number: MC9S12E128CFU
• Description: IC MCU 128K FLASH 25MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12E128CFU

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 60
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 2.75 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Data Bus Width: 16 bit
• Data Ram Size: 8 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.135 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• On-chip Dac: 8 bit, 2 Channel
• For Use With: M68EVB912E128 - BOARD EVAL FOR MC9S12E128/64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: No RoHS Version Available

Appendix A Electrical Characteristics
The loop bandwidth f
typical values are 50. = 0.9 ensures a good transient response.
And finally the frequency relationship is defined as
With the above values the resistance can be calculated. The example is shown for a loop bandwidth
f
The capacitance C
The capacitance C
A.3.3.2
The basic functionality of the PLL is shown in
deviation from the reference clock f
accordingly.The adjustment is done continuously with no abrupt changes in the clock output frequency.
Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in
578
C
=10kHz:
f
C
<
------------------------------------------
R
2
Jitter Information
=
+
C
2
---------------------------- -
s
p
s
can now be calculated as:
should be chosen in the range of:
1
f
C
ref
=
+
K
should be chosen to fulfill the Gardner’s stability criteria by at least a factor of 10,
n
--------------------- -
n f
2
2
=
C
f
s
C
C
f
-------------
----- -
10
1
VCO
f
2
20 C
ref
R
= 2* *50*10kHz/(316.7Hz/ )=9.9k =~10k
ref
MC9S12E128 Data Sheet, Rev. 1.07
f
is measured and input voltage to the VCO is adjusted
=
f
0.516
-------------- -
f
C
C
C
p
<
2
< 25kHz
R
------------ -
4 10
f
C
ref
;
Figure
synr
s
=
;
10
0.9
A-2. With each transition of the clock f
+
=
1
0.9
C
p
= 5.19nF =~ 4.7nF
= 470pF
= 50
Freescale Semiconductor
Figure
cmp
A-3.
, the