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Chapter 1 Device Overview MC9S12XE-Family
MC9S12XE-Family Reference Manual , Rev. 1.07
62
Freescale Semiconductor
1.2.3.78
PT[5] / IOC[5] / VREG_API— Port T I/O Pins [5]
PT[5] is a general-purpose input or output pin. It can be configured as input capture or output compare pin
IOC[5] of the enhanced capture timer (ECT) or can be configured to output the VREG_API signal.
1.2.3.79
PT[4:0] / IOC[4:0] — Port T I/O Pins [4:0]
PT[4:0] are general-purpose input or output pins. They can be configured as input capture or output
compare pins IOC[4:0] of the enhanced capture timer (ECT).
1.2.4
Power Supply Pins
MC9S12XE-Family power and ground pins are described below.
Becausefastsignaltransitionsplacehigh,short-durationcurrentdemandsonthepowersupply,usebypass
capacitors with high-frequency characteristics and place them as close to the MCU as possible.
NOTE
All V
SS
pins must be connected together in the application.
1.2.4.1
VDDX[7:1], VSSX[7:1] — Power and Ground Pins for I/O Drivers
ExternalpowerandgroundforI/Odrivers.BypassrequirementsdependonhowheavilytheMCUpinsare
loaded. All V
DDX
pins are connected together internally. All V
SSX
pins are connected together internally.
1.2.4.2
VDDR — Power Pin for Internal Voltage Regulator
Inputtotheinternalvoltageregulator.Theinternalvoltageregulatoristurnedoff,ifV
DDR
istiedtoground
1.2.4.3
VDD, VSS1,VSS2,VSS3 — Core Power Pins
Power is supplied to the MCU core from the internal voltage regulator, whose load capacitor must be
connected to VDD. The voltage supply of nominally 1.8V is derived from the internal voltage regulator.
The return current path is through the VSS1,VSS2 and VSS3 pins. No static external loading of these pins
is permitted.
1.2.4.4
VDDF — NVM Power Pin
Power is supplied to the MCU NVM through VDDF . The voltage supply of nominally 2.8V is derived
from the internal voltage regulator. No static external loading of these pins is permitted.
1.2.4.5
VDDA2, VDDA1, VSSA2
,
VSSA1 — Power Supply Pins for ATD and
Voltage Regulator
These are the power supply and ground input pins for the analog-to-digital converters and the voltage
regulator. Internally the V
DDA
pins are connected together. Internally the V
SSA
pins are connected
together.