OWWRBIT Pin, BitVal

Function
Writes one bit to a 1-Wire bus.

• Pin  is any SX I/O pin (RA.0 .. RA.7, RB.0 .. RB.7, RC.0 .. RC.7, RD.0 .. RD.7, RE.0 .. RE.7).
• BitVal  is a variable or constant value (0 to 1) that will be written to the 1-Wire bus.

Quick Facts

	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.

Explanation
After reset, 1-Wire transactions require writing values to the bus. While this is typically handled with OWWRBYTE, SX/B supports bit access with the OWWRBIT instruction. A bit is written by generating a timed low pulse on the DQ line; this is called a "Write Slot." The diagrams and tables below details the Write Slot sequences generated by the SX with OWWRBIT.

WRITE 0

Note	Timing	Description
A	60 µS	Write Slot 0 (SX master)
B	~ 10 µS	Write Slot recovery

WRITE 1

Note	Timing	Description
A	5 µS	Write Slot 1 (SX master)
B	~ 65 µS	Write Slot recovery

Related instructions: OWRESET, OWRDBIT, OWRDBYTE, and OWWRBYTE