© 2000 Scenix Semiconductor, Inc. All rights reserved. 117 SX User’s Manual Rev. 3.1 www.scenix.com Chapter 3 Instruction Set 3.6.47    RR fr Rotate fr Right through Carry Operation: fr = >> fr Bits affected: C Opcode: 0011 001f ffff Description: This instruction rotates the bits of the specified file register right using the C bit bit.
The bits inside the register are shifted right by one bit position. C is shifted into the
most significant bit position and the least significant bit is shifted out into C, as
shown in the diagram below. Cycles: 1 Example 1: rr $0F This example rotates the bits of file register 0Fh. If the register initially contains 12h
and the C bit is set to 1, after executing this instruction, the register will contain 89h
and the C bit will be cleared to 0. Example 2: clrb $03.0 ;clear carry bit rr $0F ;rotate right, reg=reg/2 clrb $03.0 ;clear carry bit rr $0F ;rotate right, reg=reg/2 This example divides file register 0Fh by 4. The “clrb” instructions ensure that 0 will  be  shifted  into  the  most  significant  bit  positions.  The  two  “rr”  instructions perform two divide-by-2 operations. Figure 3-5 Rotate fr Right Through Carry File Register Carry Bit