mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 40

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Pinout and Signal Descriptions
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
Technical Data
40
DDA
, V
SSA
Power and ground pins are described below and summarized in
3-1.
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. Bypass requirements
depend on how heavily the MCU pins are loaded.
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 ATD to be bypassed
independently. Connecting V
used will not result in an increase of power consumption.
V
V
If the ATD modules are not used, leaving V
result in an increase of power consumption.
DD
RH0
RH1
DDX
Freescale Semiconductor, Inc.
) and Ground (V
For More Information On This Product,
, V
, V
) and Ground (V
RL0
RL1
Pinout and Signal Descriptions
: reference voltage high and low for ATD converter 0.
: reference voltage high and low for ATD converter 1.
Go to: www.freescale.com
SS
SSX
)
RH
)
, V
DDA
RL
)
to V
DD
DD
if the ATD modules are not
and V
RH
MC68HC912DG128 — Rev 3.0
connected to V
SS
. Because fast signal
MOTOROLA
DD
will not
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