MC912DG128A Motorola, MC912DG128A Datasheet - Page 31

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

Power Supply Pins
Internal Power
(V
(V
External Power
(V
Ground (V
V
Analog to Digital
Reference
Voltages (V
V
5-pins
MOTOROLA
DDA
DDPLL
DD
SS
DDX
)
) and Ground
, V
) and
, V
SSA
SSPLL
SSX
RH
)
, V
RL
)
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.
Provides operating voltage and ground for the Phase-Locked Loop. This
allows the supply voltage to the PLL to be bypassed independently.
RH0
RH1
, V
, 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
5.
DD
and V
RH
connected to V
Pinout and Signal Descriptions
MC68HC912DT128A Rev 2.0
SS
. Because fast signal
Power Supply Pins
DD
will not
31