4.1.6 Interrupt Return Mode

The retfie PIC18 instruction can be followed by “f” (no comma) to indicate that the shadow registers should be retrieved and copied to their corresponding registers on execution. Without this modifier, the registers are not updated from the shadow registers. This syntax is not relevant for Baseline and Mid-range devices.

The following examples show both forms and the opcodes they generate.

0011  retfie f    ;shadow registers copied
0010  retfie      ;return without copy

The “0” and “1” operands indicated in the device data sheet can be alternatively used if desired.