MC9S12A128 MOTOROLA [Motorola, Inc], MC9S12A128 Datasheet - Page 36

• Manufacturer Part Number: MC9S12A128
• Description: Microcontroller unit (MCU)
• Manufacturer: MOTOROLA [Motorola, Inc]

MC9S12A128 Device Guide — V01.01
2.4.3 V
Power is supplied to the MCU through V
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 V
2.4.4 V
V
converter. It also provides the reference for the internal voltage regulator. This allows the supply voltage
to the ATD and the reference voltage to be bypassed independently.
2.4.5 V
V
2.4.6 V
Provides operating voltage and ground for the Oscillator and the Phased-Locked Loop. This allows the
supply voltage to the Oscillator and PLL to be bypassed independently. This 2.5V voltage is generated by
the internal voltage regulator.
2.4.7 V
Enables the internal 5V to 2.5V voltage regulator. If this pin is tied low, V
supplied externally.
DDA
RH
36
NOTE:
NOTE:
and V
, V
SSA
DD1
DDA
RH
DDPLL
REGEN
RL
are the power supply and ground input pins for the voltage regulator and the analog to digital
, V
are the reference voltage input pins for the analog to digital converter.
, V
No load allowed except for bypass capacitors.
No load allowed except for bypass capacitors.
REGEN
, V
RL
, V
DD2
SSA
— On Chip Voltage Regulator Enable
— ATD Reference Voltage Input Pins
SSPLL
is tied to ground.
, V
— Power Supply Pins for ATD and VREG
SS1
— Power Supply Pins for PLL
, V
SS2
— Core Power Pins
DD
and V
SS
. Because fast signal transitions place high,
DD1,2
and V
DDPLL
must be