I2CSTOP Pin

Function
Generates an I2C Stop condition.

• Pin defines the SDA pin of the I2C bus. Pin may any I/O pin except RA.3 (RA.7 on the SX52), RB.7, RC.7, RD.6, or RE.6 (see below).

Quick Facts

	SX18/20	SX28	SX48	SX52
SDA pin	RA.0 .. RA.2 RB.0 .. RB.6	RA.0 .. RA.2 RB.0 .. RB.6 RC.0 .. RC.6	RA.0 .. RA.2 RB.0 .. RB.6 RC.0 .. RC.6 RD.0 .. RD.6 RE.0 .. RE.6	RA.0 .. RA.6 RB.0 .. RB.6 RC.0 .. RC.6 RD.0 .. RD.6 RE.0 .. RE.6
SCL pin	Next pin in same group as SDA assignment.
Transmission rate	Approximately 50 kBits/sec.
Special Notes	Both the SDA and SCL pins must have 4.7 kΩ pull-up resisters.

Explanation
The I2C protocol is a form of synchronous serial communication developed by Philips Semiconductor. It only requires two I/O pins and both pins can be shared between multiple I2C devices. The I2CSTOP instruction generates an I2C Stop condition on the I2C bus (SDA and SCL pins); this condition is used to terminate a transmission sequence.

Note that the SCL pin is automatically assigned to the next higher pin in the same group as the SDA pin, so the SDA pin may not be assigned to RA.3 (RA.6 on the SX52), RB.7, RC.7, RD.7, or RE.7.

Related instructions: I2CSTART, I2CSEND, and I2CRECV