EB381D Ver la hoja de datos (PDF) - Motorola => Freescale

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EB381D

Migrating from the MC68HC811E2 to the MC68HC11F1

Motorola => Freescale 

Freescale Semiconductor, Inc.

Engineering Bulletin

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.

WE

OE

R/W

E

ADDRESS/DATA

AS

68HC811E9

LE

D

LATCH

OE

Q

DATA

EPROM

OE

CE

ADDRESS

DATA

WE

OE

RAM

ADDRESS CE

HIGH ADDRESS

Figure 8. MC68HC811E2 Multiplexed Bus Example

DECODE

EB381

12

MOTOROLA

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