I2CSEND Pin, ByteVal {, AckVar}

Function
Sends ByteVal on the I2C bus defined by Pin.

• 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).
• ByteVal  is a variable or constant (0 - 255) that will be transmitted on the I2C bus.
• AckVar  is an optional bit-variable that will hold the Ack/Nak status bit returned by the slave device.

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 I2CSEND instruction transmits an eight-bit value to a previously addressed device on the I2C bus (SDA and SCL pins).

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.7 on the SX52), RB.7, RC.7, RD.7, or RE.7.

Related instructions: I2CRECV, I2CSTART, and I2CSTOP