For those who didn't follow the previous thread the question is
what happens when the instruction is executed.

        RRF STATUS,F

The emulator answer provided by Andy Warren  is:-

If the STATUS register holds ABCDEFGH before...

    After RRF STATUS,F:

        STATUS = HABDEFGH (just as we saw above, the MSB gets a copy
                 of the Carry flag.  /TO and /PD don't change, since
                 they're read-only, and DC, Z, and C don't change
                 because their protected by logic within the PIC)


The remaining puzzle is why is are DC and Z flags being updated
after RRF instruction is executed. Data book says only C should be
updated (obviously).

Otherwise it all makes sense...



Ray Gardiner Technical Director DSP Systems email to: ray@dsp-systems.com
private email to: ray@netspace.net.au          http://www.dsp-systems.com