MC68HC705C8ACFNE Datasheet, PDF (29/222 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
General Description
Pin Functions
1.7 Pin Functions
This subsection describes the MC68HC705C8A signals. Reference is
made, where applicable, to other sections that contain more detail about
the function being performed.
1.7.1 V_DD and V_SS
V_DD and V_SS are the power supply and ground pins. The MCU operates
from a single 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. Place
bypass capacitors as close to the
MCU as possible, as shown in
Figure 1-7.
V+
V_DD
+
MCU
C1
C2
V_SS
Figure 1-7. Bypassing Layout
Recommendation
1.7.2 V_PP
NOTE:
This pin provides the programming voltage to the EPROM array. For
normal operation, V_PP shuld be tied to V_DD.
Connecting the V_PP pin (programming voltage) to V_SS (ground) could
result in damage to the MCU.
MC68HC705C8A — Rev. 3
MOTOROLA
General Description
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Technical Data