Basic Micro Studio Syntax Manual

ADIN16
Syntax
adin16 pin, result
• Pin - is a constant, variable or expression of an analog capable pin. See table from ADIN.
Commands
• Result - is a word (or larger) sized variable where the analog to digital sample will be store.
Supported
• BA - Supported
• BAN - Supported
• BAP - Supported
• BAP40 - Supported
Description
ADIN16 was create to generate a more accurate reading from the analog to digital hardware. The
typical A/D reading has a value range of 0 to 1024. ADIN16 drastically improves this by over sampling
which results in a higher resolution A/D range. It sets up the A/D converter and stores the sum of 64
conversions in a result variable. The result variable will contain a 16 bit sum of all the conversions.
This value can be used as a 16 bit resolution A/D reading which will be some what noisy. The noise
can be cleaned up by right shifting the value. This produces better results than a standard A/D
conversion value.
Notes
1. 64 readings are taken which increase the time need to produce a result. The A/D is a separate
piece of hardware which functions outside of the main MCU. ADIN16 will have little affect on the
processing speed as the multiple conversions happen very fast relative to the entire instruction
time.
Example
The following example will load the result into the variable temp then right shift it 4 times. This gives
an A/D range of 0 to 4095 which is 4 times better than a standard 0 to 1023 reading.
temp var word
main
adin16 p0,temp
temp = temp>>4 ;temp will hold a 12bit decimated A/D conversion
serout s_out,i9600,[“Conversion = “,dec temp,13]
pause 100
goto main
Schematic
See ADIN.
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