22.5.2.4 Acknowledge Generation

User software should configure an Acknowledge sequence using ACKC bits (I2CxCON2[23:22]). When ACKC is configured with "00", setting the ACKEN bit (I2CxCON1[4]) enables the generation of a host Acknowledge sequence.

Note: The lower five bits of the I2CxCON or I2CxCONL register must be ‘0’ (host logic inactive) before attempting to set the ACKEN bit.

Figure 22-10 illustrates an ACK sequence, and Figure 22-11 illustrates a NACK sequence. The ACKDT bit (I2CxCON1[5] specifies an ACK or NACK sequence.

After two baud periods, the ACKEN bit is automatically cleared and the module generates the I2CxIF interrupt, if the HACKSIE(I2CxINTC[11]) bit and HSTIE(I2CxINTC[13]) are enabled.

Figure 22-10. Host Acknowledge (ACK) Timing Diagram

Figure 22-11. Host Not Acknowledge (NACK) Timing Diagram