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MC68HC705P9CS Datasheet(PDF) 26 Page - Freescale Semiconductor, Inc

Part # MC68HC705P9CS
Description  Microcontrollers
PDF  160 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS Datasheet(HTML) 26 Page - Freescale Semiconductor, Inc

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Pin Descriptions
Technical Data
MC68HC705P9 — Rev. 4.0
26
Pin Descriptions
MOTOROLA
2.2 Pin Assignments
Figure 2-1. Pin Assignments
2.3 Pin Functions
2.3.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates
from a single 5-V power supply.
Very fast signal transitions occur
on the MCU pins, placing high
short-duration current demands
on the power supply. To prevent
noise problems, take special
care to provide good power
supply bypassing at the MCU as
Figure 2-2 shows. Place the
bypass capacitors as close as
possible to the MCU. C2 is an
optional bulk current bypass capacitor for use in applications that require
the port pins to source high current levels.
RESET
IRQ/VPP
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB5/SDO
PB6/SDI
PB7/SCK
VSS
VDD
OSC1
OSC2
PD7/TCAP
TCMP
PD5
PC0
PC1
PC2
PC3/AN3
PC4/AN2
PC5/AN1
PC6/AN0
PC7/VRH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
MCU
C1
0.1
µF
C2
VDD
+
Figure 2-2. Bypassing
Recommendation
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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