Assembler: please kick me in the right direction

[Demon]

I'm going with basic for the multiplication. Only problem is that table 4.1 in this document is confusing:
http://xess.com/manuals/asm51.pdf

The entry for MUL is:

B x A --> B,A

Ok, so what does that mean? The result is placed in both A and B? In addition, the result is accumulated in the first variable. I expected something similar, either in the first, or in the second, but not both. Obviously I'm misunderstanding something here.

I tried finding Note 7, but I can't see it anywhere.

Robert

[Luciano]

Intel 8051

(The result is sixteen-bit)

Multiplies the unsigned value of the Accumulator by the unsigned value of
the "B" register. The least significant byte of the result is placed in the
Accumulator and the most-significant-byte is placed in the "B" register.


---------------------------------------------


MCS 51 Microcontroller Family User's manual. (15 MB file).
(Original data-book scanned).
See PDF page 90
ftp://download.intel.com/design/MCS5...S/27238302.pdf

* * *

8051 Instruction Set (300K file).
See PDF page 50
http://batronix.com/pdf/befehle.pdf

* * *

80C51 family programmer’s guide and instruction set. (270K file)
See PDF page 43
http://www.logiccell.com/~jean/8051/3082.pdf

* * *

[Demon]

Thanks for all the replies.

I still have to control individual characters, contrast and the touch screen, but I got it to work. I printed xF0 across the entire LCD, to make it easy to see output. I have the LCD on inverse in this example, the top of the line should be high, not the bottom.

The Hantronix code is incomplete for an Optrex LCD, you have to scour through the Optrex code and add missing control codes. Once I get the characters to come out properly, I'll see about putting out a bitmap.

One idea I'm toying with is rotating the LCD and printing in portrait instead of landscape mode. There are applications where I want a vertical LCD instead of horizontal (like a list of single-word commands).

I'll post the code once I've sufficiently changed it and made it my own. I don't want to be bothered with Hantronix and copyright laws.

Robert

[Demon]

There you go:

http://www.picbasic.co.uk/forum/showthread.php?p=16269

Robert