68300

See Table 4-16, same book.

Jeff





Robert Yablonski <yabo@...> on 06/17/2002 01:34:37 PM

Please respond to 68300@yahoogroups.com

To:    68300@yahoogroups.com
cc:
Subject:    RE: [68300] 68376: RS485 half duplex setup


Group,

I am confused about how to assign Data Port pull up/down functions during
reset.  According to table 4-19, chip select pin functions, I can change
the meaning of several of the pins during reset.  There are twelve pins
shown, but in the text it says that only 8 data bus lines are associated.

How are they mapped?

The user manual says refer to 4.8.4, which even confused me more.

I have taken over an existing design where the previous engineer has
assigned boot values to the data bus as follows.

D0 = 1
D1 = 1
D2 = 1
D3 = 0
D4 = 1
D5 = 1
D6 = 1
D7 = 1
D8 = 0
D9 = 0
D11 = 1

NOTICE D10 WAS SKIPPED

How do I figure out how Table 4-19 is initialized?

Robert E. Yablonski
Hunt Dabney & Associates



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