S12ECT16B8CV2 datasheet(83/152 Pages) NXP

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MC9S12XDP512 Device User Guide — 9S12XDP512DGV1/D V01.12

2.3.64 PS0 / RXD0 — Port S I/O Pin 0

PS0 is a general purpose input or output pin. It can be configured as the receive pin RXD of Serial

Communication Interface 0 (SCI0).

2.3.65 PT[7:0] / IOC[7:0] — Port T I/O Pins [7:0]

PT7-PT0 are general purpose input or output pins. They can be configured as input capture or output

compare pins IOC7-IOC0 of the Enhanced Capture Timer (ECT).

2.4 Power Supply Pins

MC9S12XDP512 power and ground pins are described below.

NOTE:

All VSS pins must be connected together in the application.

2.4.1 VDDX1, VDDX2, VSSX1,VSSX2 — Power & Ground Pins for I/O Drivers

External power and ground for I/O drivers. Because fast signal transitions place high, short-duration

current demands on the power supply, use bypass capacitors with high-frequency characteristics and place

them as close to the MCU as possible. Bypass requirements depend on how heavily the MCU pins are

loaded.

2.4.2 VDDR1, VDDR2, VSSR1, VSSR2 — Power & Ground Pins for I/O Drivers

& for Internal Voltage Regulator

External power and ground for I/O drivers and input to the internal voltage regulator. Because fast signal

transitions place high, short-duration current demands on the power supply, use bypass capacitors with

high-frequency characteristics and place them as close to the MCU as possible. Bypass requirements

depend on how heavily the MCU pins are loaded.

2.4.3 VDD1, VDD2, VSS1, VSS2 — Core Power Pins

Power is supplied to the MCU through VDD and VSS. Because fast signal transitions place high,

short-duration current demands on the power supply, use bypass capacitors with high-frequency

characteristics and place them as close to the MCU as possible. This 2.5V supply is derived from the

internal voltage regulator. There is no static load on those pins allowed. The internal voltage regulator is

turned off, if VREGEN is tied to ground.

NOTE:

No load allowed except for bypass capacitors.

2.4.4 VDDA, VSSA — Power Supply Pins for ATD and VREG

VDDA, VSSA are the power supply and ground input pins for the voltage regulator and the analog to

digital converters.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

S12ECT16B8CV2 Datasheet(PDF) 83 Page - NXP Semiconductors