s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 56

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

INSTRUCTION SET
Rotate right (ROR) operations reuse the bits which overshoot in a logical shift right operation by reintroducing
them at the high end of the result, in place of the zeros used to fill the high end in logical right operations. For
example, ROR #5 is shown in Figure 3-9. The form of the shift field which might be expected to give ROR #0 is
used to encode a special function of the barrel shifter, rotate right extended (RRX). This is a rotate right by one
bit position of the 33 bit quantity formed by appending the CPSR C flag to the most significant end of the
contents of Rm as shown in Figure 3-10.
3-14
C
in
31
31
Figure 3-10. Rotate Right Extended
Figure 3-9. Rotate Right
Value of Operand 2
Contents of Rm
Value of Operand 2
Contents of Rm
5
4
1
0
carry out
carry out
0
S3C4510B