MC912DG128AMPVE Freescale Semiconductor, MC912DG128AMPVE Datasheet - Page 203

IC MCU 128K FLASH 8MHZ 112-LQFP

MC912DG128AMPVE

Manufacturer Part Number
MC912DG128AMPVE
Description
IC MCU 128K FLASH 8MHZ 112-LQFP
Manufacturer
Freescale Semiconductor
Series
HC12r
Datasheet

Specifications of MC912DG128AMPVE

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 ~ 125°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
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWHCS12
Minimum Operating Temperature
- 40 C
On-chip Adc
2 (8-ch x 10-bit)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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13.4.2.2 Gain Margin
13.4.2.3 Optimizing Component Values
MC68HC912DT128A — Rev 4.0
MOTOROLA
The Gain Margin of the oscillator indicates the amount the gain of the
oscillator can vary while maintaining oscillation. Specifically, Gain
Margin is:
Gain Margin = MIN(gain/minimum required gain, maximum allowed
gain/gain)
Just like NRM, Gain Margin may be dominated by either too much or too
little oscillator gain and an increase in gain may not increase Gain
Margin. Gain Margin is theoretically related to NRM since the maximum
allowed gain is (approximately) inversely proportional to ESR, and the
minimum required gain is (approximately) proportional to ESR, leaving
Gain Margin (approximately) inversely proportional to ESR.
The preferred method for specifying the oscillator, given a set of load
capacitor values, is to determine the maximum allowed while
maintaining a worst-case Gain Margin of 2. Since Gain Margin is
proportional to ESR, this means the empirically measured NRM at the
worst-case point would be approximately twice the maximum allowed
ESR. However, since typical NRM is likely to be higher and most
measurement techniques do not account for ALC effects, actual NRM
measurements are likely to be much higher.
The maximum ESR possible (given a worst-case Gain Margin of 2) is not
the optimum operating point. In some cases, the frequency accuracy of
the oscillator is important and in other cases satisfying the traditional
NRM measurement technique is important.
If frequency accuracy is important, the total load capacitance (the
combination of the load capacitors and their associated parasitics)
should be equal (or close to equal) to the rated load capacitance of the
resonator. Provided the resultant load capacitors yield a maximum
allowed ESR greater than the maximum ESR of the crystal (while
maintaining the worst case Gain Margin of 2), this is an acceptable
operating point. If the maximum allowed ESR is not high enough, the
closest possible components with high enough ESR should be chosen.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Oscillator
MC68HC912Dx128C Colpitts Oscillator Specification
Technical Data
Oscillator
203

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