SHIn and SHOut

[streborc]

I conducted this same test on two other PIC devices, a 12F1840 and an 18F47Q10.  There was no difference in the SHIn behavior on the 12F1840.  However, SHIn does receive its input on the 18F47Q10.  I should note that the serial LCD I was using to display the three Reg_byteX values in my test did not want to work on the 18F47Q10's PortA where the SDI, SDO and SCK pins were assigned, and had to be moved to PortB -- maybe a read/modify/write collision?  (There was no such problem on the 12 or 16 devices.  I might investigate further.)

Is this exclusionary use of SHIn on the 12 and 16 PIC families by design, or is it by limitation of these less capable uC's?  Perhaps I should graduate all my projects to PIC18 devices(?).

[streborc]

Below are the assembly code excerpts for SHIn from the PIC18F47Q10 and PIC16F18346 test programs.