8-bit rotation to the right. the bit leaving on the right is copied into the carry, and into bit 7.
RRC A RRC B RRC C RRC D RRC E RRC H RRC L RRC (HL) RRC (IX+n) RRC (IY+n)
The carry becomes the value leaving on the right, H and N are reset, P/V is parity, and S and Z are modified by definition.
r denotes 8-bit register.