Mega16 and LCD44780 connected to PORTC

not work

NickBahtin

Subject:

Mega16 and LCD44780 connected to PORTC

· Posted: 15.07.2011 - 18:10 · #1

Hi? expert's! Connect the display according to the scheme Mega163sch, only with port C -
On port "A" works - at the port "C" will not work! Help me Please!

Gunter

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Location: Frankfurt Main / Germany
Posts: 1697
Registered: 02 / 2003

Subject:

Re: Mega16 and LCD44780 connected to PORTC

· Posted: 15.07.2011 - 18:30 · #2

Hi Nick,

Port C uses some of its pins for JTAG signaling and you have
JTAG still enabled. So these pins are not available for general IO.
Disable the JTAGEN fuse (set to binary 1) or use "Disable_JTAGPORT".

Gunter

NickBahtin

Subject:

Re: Mega16 and LCD44780 connected to PORTC

· Posted: 18.07.2011 - 05:58 · #3

Thanks for the answer! TONIGHT I will check up and I will write the answer

NickBahtin

Subject:

Working!!!

· Posted: 25.07.2011 - 16:01 · #4

Thanks for your help. Earned only true option 1 (Disable the JTAGEN)
2. Disable_JTAGPORT revived the display - but it was broken. Most likely not true initialize display

Gunter

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Gender:
Location: Frankfurt Main / Germany
Posts: 1697
Registered: 02 / 2003

Subject:

Re: Mega16 and LCD44780 connected to PORTC

· Posted: 25.07.2011 - 17:05 · #5

Hi,
to use Disable_JTAGPORT you should place this statement in a SYSTEM_INIT procedure.
So the JTAG is disabled before any initalization takes place.
Note that you must not call this procedure from inside your application!

Gunter

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