lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ?

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Topic: lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? (Read 4736 times)

elRey

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	lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? « on: January 22, 2013, 08:37:40 AM »

For lambda on a 16bit LoHi scale, does 1 = 7FFF or 1 = 8000 ?

I know on a 8bit scale 1 = 80 which leads me to believe 1 = 8000 on 16bit.

Thanks,
Rey


« Last Edit: January 22, 2013, 08:40:43 AM by elRey »	Logged

phila_dot

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	Re: lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? « Reply #1 on: January 22, 2013, 08:56:44 AM »

1000h

7FFFh is max postive signed word and 8000h is max negative signed word.


« Last Edit: January 22, 2013, 09:48:53 AM by phila_dot »	Logged

slowrider

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	Re: lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? « Reply #2 on: January 22, 2013, 10:11:02 AM »

0000h LoHi => 0
0100h LoHi => 1
0200h LoHi => 2
1000h LoHi => 16


« Last Edit: January 22, 2013, 10:21:38 AM by slowrider »	Logged

nyet

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	Re: lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? « Reply #3 on: January 22, 2013, 11:45:48 AM »

btw just a nitpick LoHi is immaterial in this discussion if you are expressing hex terms in short words and not bytes.

i.e.

0x1234 = 0x12 0x34 HiLo
0x1234 = 0x34 0x12 LoHi

Both are 0x1234

When expressing values, they're always expressed big endian


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nyet

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	Re: lambda on a 16bit LoHi, 1 = 7FFF or 1 = 8000 ? « Reply #4 on: January 22, 2013, 11:48:14 AM »

Quote from: slowrider on January 22, 2013, 10:11:02 AM

0000h LoHi => 0
0100h LoHi => 1
0200h LoHi => 2
1000h LoHi => 16

More properly:

01h 00h LoHi = 1 = 0001h
02h 00h LoHi = 2 = 0002h
10h 00h LoHi = 16 = 0010h


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