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MC9S12T64 Datasheet, PDF (62/608 Pages) Motorola, Inc – Specification
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Freescale Semiconductor, Inc.
Pinout and Signal Description
Power Supply Pins
MC9S12T64 power and ground pins are described below and
summarized in Table 12.
NOTE: All VSS pins must be connected together in the applications.
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.
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.
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. No static load is allowed on these
pins. The internal voltage regulator is turned off, if VREGEN is tied to
ground.
NOTE: No load allowed except for bypass capacitors.
VDDA, VSSA —
Power Supply Pins
for ATD and VREG
VDDA and VSSA are the power supply and ground input pins for the
voltage regulator and the analog to digital converter. It also provides the
reference for the internal voltage regulator.This allows the supply
voltage to the A/D and the reference voltage to be bypassed
independently.
MC9S12T64Revision 1.1.1
Pinout and Signal Description
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