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 11:38:28 GMT
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Original-From:
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Mike Davis <ipscone@halcyon.com%IHateSpam%>
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Viewed:
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1576 times
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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 must mean
that I have to go into and out of expanded mode to use both the LCD
and the SRAM? That's kinda wierd.
Anything else you can point me to as far as addressing the LCD and
accessing SRAM via assembly code?
> Date: Sun, 03 May 1998 22:01:27 -0700
> From: Chuck McManis <cmcmanis@freegate.com>
> Reply-to: cmcmanis@freegate.com
> Organization: Freegate Corporation
> To: Mike Davis <ipscone@halcyon.com>
> Cc: handyboard@media.mit.edu
> Subject: Re: LCD Addressing - & - Expanded Mode
> 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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| From the driver code I recently sent out: * LCD Connections on the Handyboard * PORTB bit 0 - R/W * PORTB bit 1 - RS (Register Select, 0 = instruction) * PORTC 8 bits of Data * PORTA bit 4 - E clock (...) That is correct, the LCD is NOT memory (...) (27 years ago, 4-May-98, to lugnet.robotics.handyboard)
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