MC9S12XET256MAA Freescale Semiconductor, MC9S12XET256MAA Datasheet - Page 1264

• Manufacturer Part Number: MC9S12XET256MAA
• Description: MCU 16BIT 256K FLASH 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12XET256MAA

• Core Processor: HCS12X
• Core Size: 16-Bit
• Speed: 50MHz
• Connectivity: CAN, EBI/EMI, I²C, IrDA, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 59
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.72 V ~ 5.5 V
• Data Converters: A/D 12x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 80-QFP
• Processor Series: S12XE
• Core: HCS12
• Data Bus Width: 16 bit
• Data Ram Size: 16 KB
• Interface Type: CAN, SCI, SPI
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 59
• Number Of Timers: 25
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWHCS12
• Development Tools By Supplier: KIT33812ECUEVME, EVB9S12XEP100, DEMO9S12XEP100
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• Package: 80PQFP
• Family Name: HCS12X
• Maximum Speed: 50 MHz
• Operating Supply Voltage: 1.8|2.8|5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Appendix C PCB Layout Guidelines
Appendix C
PCB Layout Guidelines
The PCB must be carefully laid out to ensure proper operation of the voltage regulator as well as of the
MCU itself. The following rules must be observed:
Example layouts are illustrated on the following pages.
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Every supply pair must be decoupled by a ceramic capacitor connected as near as possible to the
corresponding pins .
Central point of the ground star should be the VSS3 pin.
Use low ohmic low inductance connections between VSS1, VSS2 and VSS3.
VSSPLL must be directly connected to VSS3.
Keep traces of VSSPLL, EXTAL, and XTAL as short as possible and occupied board area for C7,
C8, and Q1 as small as possible.
Do not place other signals or supplies underneath area occupied by C7, C8, and Q1 and the
connection area to the MCU.
Central power input should be fed in at the VDDA/VSSA pins.
MC9S12XE-Family Reference Manual , Rev. 1.23
Freescale Semiconductor