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| MC68HC908RF2 Datasheet, PDF (29/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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1.5 Pin Assignments
Figure 1-2 shows the pin assignments.
General Description
Pin Assignments
PTA1/KBD1 1
PTA0 2
PTB0/MCLK 3
PTB1 4
PTB2/TCH0 5
GND 6
XTAL1 7
XTAL0 8
24 VDD
23 VSS
22 OSC2
21 OSC1
20 PTB3/TCLK
19 DATACLK
18 DATA
17 BAND
Figure 1-2. LQFP Pin Assignments
1.5.1 Power Supply Pins (VDD and 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 shown in
Figure 1-3. 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.
MC68HC908RF2 â Rev. 1
MOTOROLA
General Description
Advance Information
29
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