PC312XDP512F0CFVR datasheet(1292/1348 Pages) FREESCALE

Part #	PC312XDP512F0CFVR

Description	HCS12X Microcontrollers

PDF	1348 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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1292 / 1348 page

Appendix C Recommended PCB Layout

MC9S12XDP512 Data Sheet, Rev. 2.21

1294

Freescale Semiconductor

Appendix C

Recommended PCB Layout

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:

•

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, 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.

PC312XDP512F0CFVR Datasheet(PDF) 1292 Page - Freescale Semiconductor, Inc