MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 45

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

3.3 Power Supply Pins
3.3.1 Internal Power (V
3.3.2 External Power (V
3.3.3 V
3.3.4 Analog to Digital Reference Voltages (V
MC68HC912DT128A — Rev 4.0
MOTOROLA
DDA
, V
SSA
MC68HC912DT128A power and ground pins are described below and
summarized in
All power supply pins must be connected to appropriate supplies.
On no account must any pins be left floating.
Power is supplied to the MCU through V
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.
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.
Provides operating voltage and ground for the analog-to-digital
converter. This allows the supply voltage to the A/D to be bypassed
independently.
V
V
If the ATD modules are not used, leaving V
result in an increase of power consumption.
DD
RH0
RH1
DDX
) and Ground (V
, V
, V
) and Ground (V
RL0
RL1
: reference voltage high and low for ATD converter 0.
: reference voltage high and low for ATD converter 1.
Pinout and Signal Descriptions
Table
SS
3-1.
SSX
)
RH
)
, V
RL
)
DD
and V
RH
connected to V
Pinout and Signal Descriptions
SS
. Because fast signal
Power Supply Pins
Technical Data
DD
will not
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