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EB381 Datasheet(PDF) 12 Page - Motorola, Inc

Part # EB381
Description  Migrating from the MC68HC811E2 to the MC68HC11F1
PDF  16 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

EB381 Datasheet(HTML) 12 Page - Motorola, Inc

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Engineering Bulletin
EB381
12
MOTOROLA
Difference:
External Glue Logic
Requirements
Case 1
Example:
External glue logic
Issue:
Some of the external glue logic requirements are
different.
Change required: The MC68HC11F1 has a non-multiplexed
address/data bus and four programmable chip
selects. This will eliminate the need for such
external devices as a demultiplexer, a decoder,
and a latch. See Figure 8 and Figure 9.
Figure 8. MC68HC811E2 Multiplexed Bus Example
R/W
E
HIGH ADDRESS
68HC811E9
WE
OE
ADDRESS/DATA
AS
D
Q
LATCH
OE
LE
DATA
ADDRESS
EPROM
DATA
ADDRESS
RAM
DECODE
CE
OE
CE
WE
OE
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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