Rr — Rotate Right - Samsung S3F84B8 User Manual

S3F84B8_UM_REV 1.00
6.3.59 RR — ROTATE RIGHT
dst
RR
C  dst (0)
Operation:
dst (7)  dst (0)
dst (n  dst (n +1), n = 0–6
The contents of destination operand are rotated right one bit position. The initial value of bit zero
(LSB) is moved to bit 7 (MSB). It replaces the carry flag (C).
C: Set if the bit rotated from least significant bit position (bit zero) is "1".
Flags:
Z: Set if the result is "0"; cleared otherwise.
S: Set if the result bit 7 is set; cleared otherwise.
V: Set if arithmetic overflow occurred, that is, if the sign of destination changed during
rotation; cleared otherwise.
D: Unaffected.
H: Unaffected.
Format:
opc
Given register 00H = 31H, register 01H = 02H, and register 02H = 17H:
Examples:
RR
RR
In the first example, if general register 00H contains the value 31H (00110001B), the statement
"RR 00H" rotates this value one bit position to the right. The initial value of bit zero is moved to
bit 7, leaving the new value 98H (10011000B) in destination register. The initial bit zero also
resets the C flag to "1", and sign flag and overflow flag are set to "1".
C
dst
00H Register 00H = 98H, C = "1"
@01H Register 01H = 02H, register 02H = 8BH, C = "1"
7 0
Bytes
2
6-72
6 INSTRUCTION SET
Cycles Opcode
(Hex)
4 E0
4 E1
Addr Mode
dst
R
IR