MC9S12DG128MPVE Datasheet, PDF (66/128 Pages) Freescale Semiconductor, Inc – Device User Guide

MC9S12DT128B Device User G^Fu^rid^ee^e—^sV^c0^a1.^l0^e9 ^{Semiconductor, Inc.}
Pin Number
Mnemonic
112-pin QFP
VDDR
41
VSSR
40
VDDX
107
VSSX
106
VDDA
83
VSSA
86
VRL
85
VRH
84
VDDPLL
43
VSSPLL
45
VREGEN
97
Nominal
Voltage
5.0V
0V
5.0V
0V
5.0V
0V
0V
5.0V
2.5V
0V
5V
Description
External power and ground, supply to pin drivers and internal
voltage regulator.
External power and ground, supply to pin drivers.
Operating voltage and ground for the analog-to-digital
converters and the reference for the internal voltage regulator,
allows the supply voltage to the A/D to be bypassed
independently.
Reference voltages for the analog-to-digital converter.
Provides operating voltage and ground for the Phased-Locked
Loop. This allows the supply voltage to the PLL to be
bypassed independently. Internal power and ground
generated by internal regulator.
Internal Voltage Regulator enable/disable
NOTE: All VSS pins must be connected together in the application.
2.4.1 VDDX,VSSX — 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 VDDR, VSSR — 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.
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