mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 34

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.5.1 Power Supply Pins (V
1.5.2 Voltage Regulator Out (V
Technical Data
34
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 bypass capacitors as close to the MCU power pins as
possible. Use high-frequency-response ceramic capacitors for C
C
that require the port pins to source high current levels.
V
internally for the MCU operation and the USB data driver. It is also used
to supply the voltage for the external pullup resistor required on the
USB’s D– line. The V
or larger and a 0.1 F ceramic bypass capacitor as
Place the bypass capacitors as close to the V
DD
REG
BULK
and V
DD
are optional bulk current bypass capacitors for use in applications
is the 3.3 V output of the on-chip voltage regulator. V
, V
REG
SS
SS
)
are the power supply and ground pins. The MCU operates
)
General Description
Figure 1-5. Power Supply Bypassing
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
NOTE: Values shown are typical values.
REG
V
pin requires an external bulk capacitor 4.7 F
V
DD
DD
MCU
C
0.1 F
C
+
BYPASS
BULK
V
SS
REG
Freescale Semiconductor
pin as possible.
Figure 1-6
Figure 1-5
REG
shows.
is used
BYPASS
.