Chapter 9 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 463
Operation
n = RS or IMM4
Rotates the bits in register RD n positions to the right. The upper n bits of the register RD are filled with
the lower n bits. Two source forms are available. In the first form, the parameter n is contained in the
instruction code as an immediate operand. In the second form, the parameter is contained in the lower bits
of the source register RS[3:0]. All other bits in RS are ignored. If nis zero no shift will take place and the
register RD will be unaffected; however, the condition code flags will be updated.
CCR Effects
Code and CPU Cycles
ROR Rotate Right ROR
NZVC
∆∆0—
N: Set if bit 15 of the result is set; cleared otherwise.
Z: Set if the result is $0000; cleared otherwise.
V: 0; cleared.
C: Not affected.
Source Form Address
Mode Machine Code Cycles
ROR RD, #IMM4 IMM4 0 0 0 0 1 RD IMM4 1 1 1 1 P
ROR RD, RS DYA 0 0 0 0 1 RD RS 1 0 1 1 1 P
RD
n bits