MC9S12DP256B Datasheet, PDF (82/126 Pages) Freescale Semiconductor, Inc – device made up of standard HCS12 blocks and the HCS12 processor core

MC9S12DP256B Device User G^Fui^rd^ee^e—^scV0^a2.^l1^e5 ^{Semiconductor, Inc.}
• Every supply pair must be decoupled by a ceramic capacitor connected as near as
possible to the corresponding pins(C1 - C6).
• Central point of the ground star should be the VSSR pin.
• Use low ohmic low inductance connections between VSS1, VSS2 and VSSR.
• VSSPLL must be directly connected to VSSR.
• Keep traces of VSSPLL, EXTAL and XTAL as short as possible and occupied board area
for C7, C8, C11 and Q1 as small as possible.
• Do not place other signals or supplies underneath area occupied by C7, C8, C10 and Q1
and the connection area to the MCU.
• Central power input should be fed in at the VDDA/VSSA pins.
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