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| MC68HC705P9 Datasheet, PDF (26/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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Pin Descriptions
Freescale Semiconductor, Inc.
2.2 Pin Assignments
RESET 1
IRQ/VPP 2
PA7 3
PA6 4
PA5 5
PA4 6
PA3 7
PA2 8
PA1 9
PA0 10
PB5/SDO 11
PB6/SDI 12
PB7/SCK 13
VSS 14
28 VDD
27 OSC1
26 OSC2
25 PD7/TCAP
24 TCMP
23 PD5
22 PC0
21 PC1
20 PC2
19 PC3/AN3
18 PC4/AN2
17 PC5/AN1
16 PC6/AN0
15 PC7/VRH
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
MCU
on the MCU pins, placing high
short-duration current demands
C1
0.1 µF
on the power supply. To prevent
noise problems, take special
C2
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
VDD
Figure 2-2. Bypassing
Recommendation
optional bulk current bypass capacitor for use in applications that require
the port pins to source high current levels.
Technical Data
26
Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
MC68HC705P9 â Rev. 4.0
MOTOROLA
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