30.4.2.3 EUSART Synchronous Client Reception

The operation of the Synchronous Host and Client modes is identical (see Synchronous Host Reception), with the following exceptions:

• Sleep
• CREN bit is always set, therefore the receiver is never Idle
• SREN bit, which is a “don’t care” in Client mode

A character may be received while in Sleep mode by setting the CREN bit prior to entering Sleep. Once the word is received, the RSR register will transfer the data to the RCxREG register. If the RCxIE enable bit is set, the interrupt generated will wake the device from Sleep and execute the next instruction. If the GIE bit is also set, the program will branch to the interrupt vector.