SHIFT LEFT & SHIFT RIGHT with the 8051 and PIC18

[Stefke]

shift 8051

Dear developers

How can I implement an shift left and shift right instruction with using the default instructionset for the 8051 and PIC18

Can somebody help me with give code examples for create SHIFT functions in assembly only?

Thanks
Stefke

 

[blueroomelectronics]

8051 shift

It's a single instruction on the PIC.

 

[VVV]

pic18f rotate right

Use the rotate instructions, making sure the carry flag is clear before that.
For the 8051 assume the byte to rotate is in the accumulator, for the PIc assume it's in file register named Byte.

Ex 8051
clr C
rlc A ;for shift left
rrc A ;for shift right

Ex PIC18
bcf STATUS,C
rlcf Byte ;for left shift
rrcf Byte; for right shift

If you need multiple shifts, repeat the above steps the required # of times.