OWRDBIT Pin, Bit Var
Reads one bit from a 1-Wire bus.
|All SX Models|
|Special Notes||The DQ pin (specified by Pin) must have a 4.7 kΩ pull-up resister.|
|1-Wire commands require a FREQ setting of 4 MHz or higher.|
Some 1-Wire transactions require reading data from the device. While this is typically handled with OWRDBYTE, SX/B supports bit access with the OWRDBIT instruction. A 1-Wire read is accomplished by generating a brief (5 µS) low-pulse and sampling the DQ pin within 15 µS of the falling edge of the pulse. This is called a "Read Slot." The diagram and table below details the Read Slot sequence generated by the SX with OWRDBIT.
|A||5 µS||Initiate Read Slot (SX master)|
|B||10 µS||Delay before sampling DQ|
|C||~ 60 µS||Read Slot recovery|
Related instructions: OWRESET, OWRDBYTE, OWWRBIT, and OWWRBYTE