MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 39

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

General Description
1.6 Pin Functions
1.6.1 Power Supply Pins (V
1.6.2 Analog Power Supply Pin (V
Technical Data
40
Description of pin functions are provided here.
V
from a single power supply.
Fast signal transitions on MCU pins place high, short-duration current
demands on the power supply. To prevent noise problems, take special
care to provide power supply bypassing at the MCU as
shows. Place the C1 bypass capacitor as close to the MCU as possible.
Use a high-frequency-response ceramic capacitor for C1. C2 is an
optional bulk current bypass capacitor for use in applications that require
the port pins to source high current levels. V
proper MCU operation.
V
V
immunity, route V
as close as possible to the package (see
DD
DDA
DDA
and V
DD
is the voltage supply for the analog parts of the MCU. Connect the
pin to the same voltage potential as V
and V
SS
DDA
V
are the power supply and ground pins. The MCU operates
DD
SS
V
General Description
Figure 1-4. Power Supply Bypassing
MCU
DD
)
)
DDA
NOTE: Component values shown
via a separate trace and place bypass capacitors
0.1 µF
C1(a)
C2(a)
+
represent typical applications.
V
SS
0.1 µF
Figure
C1(b)
C2(b)
DD
SS
+
. For maximum noise
must be grounded for
MC68HC908LJ12
1-4).
Freescale Semiconductor
V
DD
V
DDA
Figure 1-4
—
Rev. 2.1