MC912DG128AMPVE Freescale Semiconductor, MC912DG128AMPVE Datasheet - Page 224

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

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

Oscillator
13.5.4 MC68HC912Dx128P Guidelines
Technical Data
224
NOTE:
NOTE:
Proper and robust operation of the oscillator circuit requires excellent
board layout design practice. Poor layout of the application board can
contribute to EMC susceptibility, noise generation, slow starting
oscillators, and reaction to noise on the clock input buffer. In addition to
published errata for the MC68HC912DT128A, the following guidelines
must be followed or failure in operation may occur.
An increase in the EXTAL–VSS or XTAL–VSS parasitic as a result of
reducing EXTAL–XTAL parasitic is acceptable provided the component
values are reduced by the appropriate value.
EXTAL and XTAL routing resistances are less important than
capacitances. Using minimum width traces is an acceptable trade-off to
reduce capacitance.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Minimize Capacitance between EXTAL and XTAL traces —
The Pierce oscillator architecture is sensitive to capacitance in
parallel with the resonator (from EXTAL to XTAL). To reduce this
capacitance, run a shield trace (connected to VSS) between
EXTAL and XTAL as far as possible.
Shield all oscillator components from all noisy traces. If the
VSS used for shielding is not identical to the oscillator reference,
it must be considered a noisy signal.
Keep the VSSPLL pin and the VSS reference to the oscillator
as identical as possible. Impedance between these signals must
be minimum.
Observe best practice supply bypassing on all MCU power
pins. The oscillator’s supply reference is VDD, not VDDPLL.
Account for XTAL–VSS and EXTAL–VSS parasitics in
component values. The specified component values assume a
maximum parasitic capacitance of 1pF for these pins.
Minimize XTAL and EXTAL routing lengths to reduce EMC
issues.
Go to: www.freescale.com
Oscillator
MC68HC912DT128A — Rev 4.0
MOTOROLA