MC912DG128ACPVER Freescale Semiconductor, MC912DG128ACPVER Datasheet - Page 449
![IC MCU 16BIT 8K FLASH 112-LQFP](/photos/12/21/122171/mc912dg128acpver_sml.jpg)
MC912DG128ACPVER
Manufacturer Part Number
MC912DG128ACPVER
Description
IC MCU 16BIT 8K FLASH 112-LQFP
Manufacturer
Freescale Semiconductor
Series
HC12r
Datasheet
1.MC912DG128ACPVER.pdf
(478 pages)
Specifications of MC912DG128ACPVER
Core Processor
CPU12
Core Size
16-Bit
Speed
8MHz
Connectivity
CAN, I²C, SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
69
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)
4.5 V ~ 5.5 V
Data Converters
A/D 16x8/10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
112-LQFP
Processor Series
HC912D
Core
HC12
Data Bus Width
16 bit
Data Ram Size
8 KB
Interface Type
CAN, I2C, SCI, SPI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
69
Number Of Timers
8
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWHCS12
Minimum Operating Temperature
- 40 C
On-chip Adc
2 (10 bit, 8 Channel)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MC912DG128ACPVERTR
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MC912DG128ACPVER
Manufacturer:
STM
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MC912DG128ACPVER
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23.3.3.2 Particular Case of an 8MHz Synthesis
MC68HC912DT128A — Rev 4.0
MOTOROLA
In both equations, the power supply should be 5V. Start with the target
loop bandwidth as a function of the other parameters, but obviously,
nothing prevents the user from starting with the capacitor value for
example. Also, remember that the smoothing capacitor is always
assumed to be one tenth of the series capacitance value.
So with:
m:
R:
C:
F
ζ:
F
for the ‘tracking’ mode:
and for the ‘acquisition’ mode:
Assume that a desired value for the damping factor of the second order
system is close to 0.9 as this leads to a satisfactory transient response.
Then, derived from the equations above,
suggest sets of values corresponding to several loop bandwidth
possibilities in the case of an 8MHz synthesis for the two cases
mentioned above.
bus
c
:
Freescale Semiconductor, Inc.
: the target bus frequency expressed in MHz
For More Information On This Product,
acquisition (AUTO=0, ACQ=0 in the PLLCR register).
the multiplying factor for the reference frequency (i.e. (synr+1))
the series resistance of the low pass filter in Ω
the series capacitance of the low pass filter in nF
the desired damping factor
the desired loop bandwidth expressed in Hz
Appendix: CGM Practical Aspects
Go to: www.freescale.com
F
F
c
c
=
=
2 10
------------------------ -
2 10
------------------------ -
π R C
π R C
⋅
⋅
⋅
⋅
9
9
⋅
⋅
⋅
⋅
ζ
ζ
2
2
=
=
415.61 e
-------------------------------------------------------- -
37.78 e
----------------------------------------------------- -
⋅
Practical Aspects For The PLL Usage
⋅
2 π m
2 π m
Table 23-1
⎛
⎝
⋅
⋅
⎛
⎝
1.675 F
---------------------------- -
1.675 F
---------------------------- -
Appendix: CGM Practical Aspects
10.795
10.795
⋅
⋅
–
–
bus
bus
⎞
⎠
⎞
⎠
⋅
⋅
R
R
and
Table 23-2
Technical Data
449
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