Basic Micro Studio Syntax Manual

OWIN
Syntax
owin pin,mode,{FailLabel,} [{modifi ers}InData1, ..., {modifi ers}InDataN]
Commands
• Pin - is a variable, constant or expression that specifi es the pin used for 1-wire data transfer.
• Mode - is a variable, constant or expression that specifi es the data transfer mode as described in
the table below.
• FailLabel - is a label the program will jump to if communications fail (no chip present).
• InData - is a list of variables with optional modifi ers to store incoming data from an attached
1-wire device.
Supported
• BA - Supported
• BAN - Supported
• BAP - Supported
• BAP40 - Supported
Modes
Mode Reset Byte / Bit Speed
0 None Byte Low
1 Before Data Byte Low
2 After Data Byte Low
3 Before and After Byte Low
4 None Bit Low
5 Before Data Bit Low
Description
The 1-wire protocol was developed by Maxim (Dallas Semiconductor). It is a 1-wire asynchronous
serial protocol that does not require a clock. Most 1-wire devices can optionally be powered from the
data line, this is known as parasitic power. This means the device is powered from an extended data
high (1) state on its data pin. A high (1) state is held briefl y to charge a small internal capacitor. One
wire is setup to have a single master device which communicates with one or more 1-wire devices
over a single data line. This network is dubbed a “MicroLan”. The master initiates and controls all
activities on the 1-wire bus.
Notes
1. The 1-wire parts use CMOS/TTL logic levels with open collector outputs. The data line requires a
4.7K pull-up.
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