Subject:
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Re: LCD Addressing - & - Expanded Mode
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 4 May 1998 05:01:27 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate*stopspam*.com>
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Reply-To:
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cmcmanis@freegate^AvoidSpam^.com
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Viewed:
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1483 times
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Mike Davis wrote:
> Two questions:
>
> 1) I'm having a little trouble figuring out how the LCD is addressed.
> It uses A8 and A8 but also is clocked from Port A.
You can only run the LCD when in single chip mode.
> 2) The Mode B pin is always grounded. How does the system get put
> into expanded mode since that mode requires Mode B to be high during
> reset? I assume it must be changed (the mode) by the downloaded
> program.
This leaves the chip in 'special test mode' that lets you go into and
out of expanded mode by writing the config register.
--Chuck
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Message has 1 Reply:
 | | Re: LCD Addressing - & - Expanded Mode
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| So, this still doesn't help me figure out how to address the LCD. It has A8 and A9 connected along with a CLK from Port A. Does this mean that the LCD is NOT memory mapped? Do I first have to write to Port B then write to Port A, to clock it. This (...) (27 years ago, 4-May-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | LCD Addressing - & - Expanded Mode
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| Two questions: 1) I'm having a little trouble figuring out how the LCD is addressed. It uses A8 and A8 but also is clocked from Port A. Can someone explain how to properly address the LCD using ASM? 2) The Mode B pin is always grounded. How does the (...) (27 years ago, 3-May-98, to lugnet.robotics.handyboard)
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