AN554 Datasheet (Microchip Technology) - Software Implementation of I2C Bus Master

AN554, Software Implementation of I2C Bus Master

OF ABBREVIATIONS USED Explanation Start Condition Stop Condition Slave Address (for read operation) Slave Address (for write operation) Acknowledge condition (positive ACK) Negative Acknowledge condition (NACK) Data byte, D[0] represents byte 0, D[1] represents second byte © 1997 Microchip Technolo

M Author: AN554 In most systems the microcontroller is the master and the external peripheral devices are slaves.

In these cases this application note can be used to attach I2C slaves to the PIC16CXXX (the master) microcontroller.

The multi-master system is not implemented because it is extremely difﬁcult to meet all the I2C Bus timing speciﬁcations using software.

For a true slave or multi-master system, some interface hardware is necessary (like START & STOP bit detection).

In addition to the