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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MC908JB16FAE
寤犲晢锛� Freescale Semiconductor
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General Description
Technical Data
MC68HC908JB16 鈥� Rev. 1.1
34
General Description
Freescale Semiconductor
1.6 Pin Functions
Description of pin functions are provided here.
1.6.1 Power Supply Pins (VDD, VSS)
VDD and VSS are the power supply and ground pins. The MCU operates
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 Figure 1-4
shows. Place the bypass capacitors as close to the MCU power pins as
possible. Use high-frequency-response ceramic capacitors for CBYPASS.
CBULK are optional bulk current bypass capacitors for use in applications
that require the port pins to source high current levels.
Figure 1-4. Power Supply Bypassing
1.6.2 Voltage Regulator Output Pin (VREG)
VREG is the 3.3V output of the on-chip voltage regulator. VREG is used
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鈥檚 D鈥� line. The VREG pin requires an external bulk capacitor 4.7F
or larger and a 0.1
F ceramic bypass capacitor as Figure 1-5 shows.
Place the bypass capacitors as close to the VREG pin as possible.
MCU
CBULK
CBYPASS
0.1 F
+
NOTE: Values shown are typical values.
VDD
VDD
VSS
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